So, I'm in the middle of it. I requested a new social security card, which should get here in less than 2 weeks. I think I can go to the DMV even before I get that (they want the marriage certificate, my license, birth certificate, and proof of insurance), and then once I get the new license I can change everything else.
But I feel funny being in last-name-limbo. It's like, according to some things I'm one person, and according to other things I'm a different person.
What a weird situation this is.
Also, FYI, the Nest has a REALLY handy checklist and how-to for name changing.