You will want to for sure get zip lock bags and a sharpie for parts. But, also start filling them with money.
My opinion is its the right way to do it (frame off), but once that body comes off, it's pretty dang difficult to put it back on without replacing a lot of old and worn out parts. The other side of it is a lot of those old and seemingly worn out parts can with some elbow grease be cleaned up, painted and made new again. Doesn't have to cost a fortune, but it usually does.
If you go this route, take a nostalgic ride in her... It will be a while before you get to again.