Changed mine on a '95 two weeks ago.

If you have a 2' breaker bar (or really stout torque wrench) you can tap the starter to loosen the crank bolt - qucik and easy.
My biggest dilemma was re-tightening it during re-assembling. Ended up having to build a tool to hold the crank stationary - nothing at the local tool store would hold up to 135 lb.ft.

If the set-up in the '90 is the same as '95 it's easy up until the a/c, it got under my skin, and even moreso, the bracket.

After that you just have the belt covers and the aluminum plate that holds all the accessory pulleys - then you're in.

I screwed up my tensioner, but I have the hydraulic one and was looking at instructions for the spring loaded type.

Getting the belt on just right and keeping all the gears on their marks is tricky, you just have to play with it and figure it out. I found it easiest to back the cam up (clockwise) just a hair to slip the belt on, then pull it back counter-clockwise to tense it back up and get the cam gear back to it's mark - ended up being the trick for me.

No clue on the spring tensioner - the instructions looked simple enough though.

Keep all the nuts and bolts straight. There's a ton of them. I generally threaded them back on/in wherever I could.

In hindsight it's not all that horrible of a job, but going in blind -- it may take you longer than you think.