It's actually super easy.
All you need is your year and make alternator belt and a wrench.
Take off the existing altenator, take off the old belt.
Once the altenator is off you'll be able to look further down below where the altenator was. You'll see a metal wheel that's a little bigger than the one on the altenator. This is where the new belt needs to wrap around.
I found it alot easier to wrap the belts around the two wheels before putting the altenator back on the engine.
Make sure that all bolts and seals are sound. (that's the last thing you need falling off in the middle of nowhere!)
Hope it helped!