How do you install spark plugs on a 1998 tercel can you please show a diagram?

First go to your local Toyota dealer and buy good spark plugs for your car, you will save in fuel milage and reliablilty...on the top of your engine there are 2 coil packs with a plug wire going to the adjacent plug, one coil fires 2 spark plugs, remove each coil and wire by slightly pulling and wiggling a the same time, check both coils and wires for cracks, damage,etc. Use a corrct size socket, extention and rachet to remove spark plugs one at a time, try not to get dirt and grime down hole in process. Always put new spark plugs in by hand to start it and not to crossthread into hole, tighten down plugs handtight with rachet, a little bit of di-electric lube on ends of spar plugs boots wouldn't hurt, put coil packs back on and don't forget to plug wiring hanress back in, if engine has a skip afterwards, double check eveything...