Hello Jaybird,
Sorry I didn't chime in earlier but there has been so much advice here I am not sure that you'd have noticed. Anyway, I worked on my 69 B last year trying to do much the same as you are except most of the grease/oil/dirt/gunk was on the underside of the car...It was a total nightmare and I got about 1/2 of the junk off the car while making my driveway an oily greasy mess. I was also aching for days afterwards.
If I were you, I'd take it a little at a time or maybe go the contracting-out route. One advantage of doing it yourself though is that, while you do it, you can do a detailed visual on anything and everything that might need work/repair.
By the way, I used something like simple green (krud kleener) and gunk and a 1300psi pressure washer hooked up to a hot water supply, brushes, rags, etc. etc. What happens, to a large degree, is that the pressure washer splashes the gunk off in all directions where it reapplies itself. This process goes on and on and on until eventually the junk ends up somewhere else (the driveway, on rags, shoe soles, clothes, etc.).
So, I hope that this message helps...good luck.