To change the oil pan gasket in a 93 Tercel

Stock the car doesn't come with an oil pan gasket but you can order one from rockauto.com you don't have to remove the A/C compressor for any of the jobs you listed. If you want to change the timing belt you need to remove the plastic rock guard under the motor on the passenger side. remove the spark plugs and using the socket turn the engine from the crankshaft clockwise until you are at TDC on #1 cyclinder. (compression stroke) Next remove the upper and lower plastic timing belt covers. The idler pulley is the one with the spring. Loosen the nut and remove the spring then you can remove the timing belt. It really isn't that hard to do. Maybe one afternoon.

There is no oil pan gasket, it is RTV sealant. unscrew the bolts, pry the oil pan off. Clean up all the old RTV ( youll notice there is no old gasket hmm!) While your at it clean out the oil pan put the new RTV sealant on and away you go. Screw it back on and wipe off squeeze out. Head bolt torque 39 foot pounds, Do proper squence and the final turn is another 90 degrees, 1/4 turn.

Drain the oil, then remove the perimeter bolts to the pan. There is nothing in the way of dropping it down. Next clean the gasket surface, and make sure it is dry. The new pan gasket should come w/ plastic guides to assure proper installation. Then just put it together. Really quite simple, it can be done in a reasonable amount of time.