Like Farns said, check the lines, etc. first to make sure. It really isn't that hard of a process.
I did it from the top in under 30 minutes, having never swapped one before. I had pulled the engine before, so I knew the two lines and I had pulled the PS pump from my other block, so I knew about the two bolts.
Removal:
-Remove the tank on the strut tower
-Remove SC belt
-Only 2 bolts holding PS pump to the engine, have to access them through the holes in the pulley(remove)
-I put a shop rag under to catch any fluid, but lost very little
-Rotated PS pump a bit
-Removed clamped hose
-Removed threaded line
-Wiggled it out of the engine bay (getting it in and out was the hardest part)
Install:
-Wiggle down in to opening
-Attach clamped line
-Attach threaded line
-Line up PS pump and start 2 bolts
-Tighten
-Fill
-Purge
-Fill, if necessary
-Put belt back on
-Put tank back on
Realistically, most steps take seconds. The hardest part was getting it in and out. Somethings I know others do, but I found unnecessary:
-Remove alternator
-Access everything from the underside
-Remove threaded line first for leverage
-Remove wheel, etc. and access from that way
-So on...
As far as manuals I got my GM Factory Service Manuals off of Ebay for a good price like new. Very informative and I use them frequently. Some of the lesser manuals can still be helpful because they have more pics and what not to get a visual. There are also CD versions available, online subscriptions, etc.
I also definately second getting a used one from Ed or a local yard before the parts stores. Hope this helps.