on these cars. Often the problem is the alty belt - tighten it a bit and see what happens. Just don't go crazy - too tight and others issues can be caused (ie., fan blade clutch is damaged). Best to tighten a little, test and do more if needed. Problem also could be the power steering belt -- just tighten away there but try the alty belt first...
Pictures of the sagging headlight issue would be helpful - removal of front bumper cover is a good way to go in removing the headlights, easy to get at all the bolts. No special write-ups that I know of for replacing the bulbs - just remove some stuff in the engine bay as needed then replace (and yes, there isn't much room to work - welcome to Z wrenching!)...