Locate VIN number and check the tenth letter. An "L" indicates '90, an "M" indicates '91 and a "N" indicates '92. It's reasonable to assume subsequent years will be alphabetical, but check your library for free info.
remove right tire, unbolt the power steering pump, go underneat unbolt the alternators damper, remove the timing belt tensor, remove the old belt, put the new belt on and repeat the process...