Hey Brian,
Installation of the gasket is a piece of cake, as long as the motor is out of the car. If the motor is still in the car it is impossible to remove the pan. You can however unbolt the motor mounts and raise the engine some to get more clearance. Once you get the new gasket in place finger tighten all the bolts then torque from the center out, first on side then the other. I think the proper torque is about 5-8 lbs. You should re-torque them after about 500 miles.
Your dirty oil could be several things depending on the condition of the engine.
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