How do you change the serpentine belt on a Chevrolet s-10 1998?

It's pretty easy top cahnge a serpentine belt. There is a belt tensioner on the front of the engine. It should have a square hole in it for a 1/2 inch ratchet or breakover bar. using one of those tools, pull back on the spring loaded tensioner and you will get slack in the belt. Slip it off and replace it.