to start with, take the pass side tire off, support the car, then with a small pail in hand remove the 2 lines off the lump, all the fluid will drain one either hose is removed. so get ready for it to drain.
then remove your coolant tank if its on the strut tower, alt removal is not needed, but can help you see better. i also unbolted my fuse box and hung it up out of the way for more room.
remove the belts.
then theres a hole in the p/s pulley, use a 13 mm and a 3 inch extension and a ratchet, theres 2 bolts, 12 and 6 o clock, remove them both, the pump will come out the top. you may have to unbolt the dog bones and pull the engine forward if it wont come out.
then use that gm p/s pulley puller, and remove the pumps pulley, and then back onto the new pump. reverse directions for install.
fill new pump with fluid and fire it up. no bleeding is needed if you keep the lines up so they dont drain on you and let air in them.
hard part is getting the new pump bolted back on, put your socket and the bolt in its hole then line it up to the bolt hole, this is where taking the alt off helps to see better.