Chargedup is right about not shaving (and the staples), if your hairloss is to the point where your hair is "see through" and scalp can easily be seen. Also, top docs usually limit this to ~2,500 FU's. Even Shapiro's rep. Janna said they once did someone w/ ~2,800 as the largest w/o shaving. The shaving is determinite to the amount of hair you already have. But whether to shave is a big decision, as some top docs require this (Feller, H&W, Rahal). I opted to shave, b/c I never got the density and results from not shaving, but this is probable due to the docs I chose. But shaving, many docs claim, makes a big difference in large sessions like the 3,000 your talking about.
P.S. Chargedup, I gotta have more cowbell!