buick serpentine belt

how hard is it to install serpentine belt on 2002 LaSabre ?

Takes 5 minutes. I just did my 02 Lesabre about 2 weeks ago. Use a wrench to release the tensioner, slip the old belt off, and put the new one on. Its a little tricky to keep the tensioner up while putting the new belt under it (use a long wrench for better leverage).

Make a note of the belt route before you take it off. If you install the belt wrong you'll have too much slack, not enough slack to get it back onthe tensioner. If you're really unlucky, you'll end up running one the belt driven accessories the wrong direction and burn it up.