I am going to do it myself, but... it's not going to be an out-and-in deal. I'm going to be getting a half-cut and removing the engine and what parts I need, then building mock-ups and such, replacing water pump, timing belt, etc while it's out of the car... and I'm going to paint the engine. It's going to be in my garage for a good month before it even goes into the car.
Another thing - it's not going to be a normal swap. I'm not going to stay SC; I'll be turbocharging it, so there will be some things I will do that the average NA>SC swap will not involve; likewise I will be able to skip some of the steps of a straight swap.
What I *will* do is take tons of pictures and document everything. I'll be sure to post when my half-cut arrives, and keep a running log on the boards.
This is my '86 NA with the blown-headgasket mod. I'm waiting on people to call/email me back about '89 Supercharged half-cuts so I can take the low-compression supercharged engine, sell the supercharger, manifolds and associated ductwork, and throw together a semi-ghetto 4A-GTE running on GZE electronics. Idea is also to get a transaxle from the newer Celica GT-S(6-speed) and alter the shift linkage to make it fit... along with some other basic while-I'm-that-far-into-the-car work.