My wife and I are going through the same thing for her Adjustment of status, she's here on an F-1 visa. It took us a little while to get the paperwork all in order(she was away for work for a few months and we needed to sort out a number of things to give us the highest chance of getting approved). For us, the hardest part was sorting through all the tiny little details and that a lot of the I-xxx forms kept expiring every couple of months during this past year. I got laid off and had to start a new job during the process, but then I had to wait a couple months to have a few paychecks to prove I can support her, but oh wait, the paychecks have my filing status as 'single' because HR screwed up, now I have to wait a few more months to get some checks with the correct tax filing status... Everything that I've read and seem makes it seem like any single incorrect detail can tank the entire application process, so we octuple-checked our forms.

Have you undergone the interview yet?