compressor belt installation

If it failed you would be better off replacing all the belts if they are the same age.
All of them come on off the same way.
For the power steering, loosen the bolts holding the power steering pump on, then back off the tensioner bolt until the belt will come off.
For the A/C belt you loosen the bolts on the idler pulley and back that tensioner bolt off until that belt comes off.
For the alternator you loosen the bolts holding the alternator on and back that adjuster off until that belt comes off.

Reverse the process to install the new belts.
Tighten the adjusters down until you get the specified deflection (push in on belt over the longest run between pulleys) on each belt
Power steering belt = 9-11mm
A/C belt = 7-9mm
Alternator belt = 5-7mm