I don't know of any diagram, but here is what I do...
The ribbed belt must come off first. It runs the power steering pump and the AC compressor.
You must loosen the power steering pump to allow slack for that belt to come off.
Eyeball the pump, see the pivot point for the pump, that bolt needs loosening. Its long and odd looking, just behind the oil dip stick. Don't remove, just loosen.
Looking at the pump from the front of the car, there are brackets to the right of the reservoir that are used to adjust the tension. The bolt facing to the right holds the tension tight, loosen it. The tensioner bolt is facing you, it needs to be turned enough for the belt to come off. Push, pry on the pump toward the engine, and loosen that bolt until the belt will come off, with a little bit of difficulty. If it aint perfect, get a new one.
The alternator must be loosened to get that belt off. Again, there is a pivot point for alternator to rock back enough to remove the belt. The bolt at the pivot point must be loosened. You have to get to it from the underside of the engine.
The adjuster is a little tricky. Look down at the alternator. You see a bolt facing you, leave that one alone. Below it, on the engine side, facing the engine, is the adjuster bolt. Loosen it, shove the alternator closer to the engine, and the belt will come off.
With new belt on, I tighten the belt with a pry bar or big screwdriver between the alternator and the engine, pry until the belt is tight but not too tight. Maybe the belt can be deflected with a push about 1/4 inch Tighten that upper adjuster bolt. If you like the tension, get under the car and tighten the pivot bolt.
Put the power steering pump belt on, rotate the adjuster bolt until you have good tension, then tighten the right hand facing bolt, then the pivot bolt behind the dip stick.
I've done this a dozen times or so, this is just from memory, if anyone sees an error, please post a correction or clarification. Good luck...