How hard of a job is it to change all the main seals on the engine and transmission. I have a full gasket and seal set and am pretty good at turning a wrench, but with no service manual I hate to have the sammi down longer than I have to. I guess I should just get a manual because there are probably certain torque settings required for certain bolts. I just ordered a new cat conveter, muffler, pcv valve, cap and rotor, fuel pump, and fuel filter. Anything else I should check or replace while I have it torn apart?