Caliper rebuild is a very pleasant job and not that hard. Excellent how to here on Pelican:
Pelican Technical Article: 911 Caliper Rebuild
Only other hint would be that you should get yourself a Gerber baby food jar lid for pressing those new rear caliper dustboots in properly until they pop into place.
I did my rears last Christmas time on my 1989 3.2. I also did all the things you're going to do. I ordered almost everything from free shipping warehouse internet places except for brake lines from Pelican. Cost me just a little over $1000 or so which included brand new front calipers and new front discs and new rear caliper springs and pins. In Canada. A weekend of work. Estimate at a local "specialist" criminal shop: $3500.
I can play my brakes like a fine musical instrument now. Completely stock Carrera 3.2 brakes properly renewed and rebuilt are ever bit as spectacular as all those magazine writers in 80's used to rave about. Porsche really, really knew what they were doing.