Adjustment Of Status Help Guide: AOS from a K-1 Fiance or K-3 Spouse Visa
Congratulations on getting your K1 visa!
 Social Security Number
One thing you may want to do is apply for your SSN. It is recommended you do this about 10-15 days after arrival in the US. This allows your data to be entered into the SAVE system which SSA accesses to verify your immigration status so a social security number can be assigned to you. It is further suggested that you apply before the 76th day of your arrival otherwise you will have to wait until you have received your EAD or Green Card. If you decide to get your SSN at this point it will have written on it "Valid for Work with DHS Authorization Only". This means you can only work with the express permission from the USCIS which would be in the form of a valid EAD or GC. Once you have your GC, you need to go back to the Social Security Office to have the legend removed. They will send you a new card without the legend and the number will remain the same. If instead you wish to wait to get your SSN, and don't plan on trying to work before then, you can apply for it when you have your GC.
 I-485 Application for Permanent Resident
Now for the actual AOS part! This is a list of forms, and supporting documents I came up with for an AOS package. I have provided links to each forms. To view the forms you made need Adobe PDF reader.
Here is some information on filling out the forms for your AOS application:
Note: K Visa's: If you were admitted to the United States as a fiance(e) (K-1), child of a fiance(e) (K-2), Spouse of a U.S. citizen (K-3), or child of K-3 (K-4), and received a medical examination prior to admission, then you do not require another medical examination as long as your application for adjustment of status (Form I-485) is filed within one year of your overseas medical examination. You will, however, be required to submit a vaccination supplement with your adjustment of status application. The vaccination supplement must be completed by a designated civil surgeon.
You must book an appointment with a USCIS approved doctor in your area, and take with you the fee they charge (it is worth calling around the designated doctors in your area as the fees can vary wildly and they seem to prefer cash), ID, and your Vaccine Worksheet from your medical examination at Knightsbridge. The USCIS doctor will fill out the appropriate parts of the I-693 and any vaccines you may still need. S/he will give you the stamped and signed form in a sealed envelope. You must NOT open this envelope. This is to be sent with your I-485 application.
Call around the USCIS doctors in your area, make sure they understand you don't need a FULL medical, only the supplement. This may mean you don't get charged a huge amount of money. Although a K-1 applicant does not need a full medical, there is usually no harm if one is provided [other than the extra expense].
Evidence of relationship:
 Employment Authorization and Advance Parole
Both EAD and AP are temporary documents to be used UNTIL you have your GC. EAD allows you to get a job and work (if you apply for SSN). When filling out form I-131, Application for Travel, you need to fill out the part for Advance Parole, multiple entries preferably. AP allows you to leave the country and enter safely until you have your GC, it is not recommended you use AP if you have been out of status in the US for 6 or more months. Once you have your GC you use that to both work and travel. DO NOT TRAVEL OUTSIDE OF THE USA WITHOUT AP OR GC!
 Fees and How to File
The Filing fee for the AOS application can be found here or in the instructions for the form.
I found the easiest way to send these documents were to use large paper clips to hold together the form I-485 with supporting documents, the same with the I-864 with supporting documents and then got a large bulldog clip to put the I-864 and documents with the I-485 and documents.
I used a separate paper clip to put the I-131 with its supporting documents, and another for the form I-765 and supporting documents. I did not attach these to the I-485 application.
I made a contents sheet for each form, listing the supporting documents I had attached with it, and my A# and full name, this I put at the front of each form.
You must submit one check or money order for the total of the filing fee and biometrics fee. Currently the full amount is $1010. You can find the filling fee information, and filing address on the I-485 instructions, pages 5 onwards. I-485 Instructions
 What Next? (NOAs and Biometrics)
AOS processing times vary from 2 months to a year. So be patient!
Once your application is submitted you will get a NOA receipt for the AOS, EAD and AP. These are to let you know they have received your forms and are processing them.
The next thing you will get is an appointment letter for your Biometrics. They will have an address of a place as local to you as they can get, a date and time for you to be there.
You will need to take the biometrics appointment letter and photo ID to your appointment. You will be asked to fill out a form on arrival. The form data will be entered into a computer, you will have your photograph taken, and your fingerprints taken. The biometrics will be used for both form I-485 (AOS) AND I-765 (EAD).
You will then hopefully receive your EAD and AP.
You may or may not be asked to go for an interview for your AOS application, you can read more about AOS interviews by searching the forums. One example of an AOS interview from pattschn
Note that all couples, and applications vary and so the interview wont be exact to this one. This is just an example of how it might go.
Whether you go for an interview or not, you will be notified by mail if you have been approved or not, If you have you will receive your green card in the post 30-60 days (times may vary due to post/weather/processing times etc.
If you are not approved I recommend seeking help from an Immigration Lawyer who can help you appeal the decision if necessary.