How do you replace the oxygen sensor on a 1997 silverado?

If you have the 5.0 or 5.7 liter take it to autozone and find out which bank/side is bad. bank 1 is drivers side, bank 2 is passenger, theres 4 total, 2 on each side in nearly same locations, 1 up by exaughst manifold each side, and 1 down by converter each side