serpintine belt

I have a 99 LeSabre Limited. No supercharger. I need to replace the AC clutch but will have to do that later. Meantime I would like to run the car without the compresor in the mix. What do I need to de to get a shorter belt in there? Are the motor mounts going to be in the way? Thanks for help

I have 91 PA 3800 series I. I wish to replace the serpentine belt and notice that the engine is connected to the body/frame on rt side near battery. Should I disconnect this and then jack up the motor to allow the belt to slip on/new on... will I run into problems trying to allign the motor...