I did a pan in the car, and if I recall I didn't have to lift the engine off its mounts, but you do have to drop the drag link/center link. Yanking the engine isn't a major tough job. Even so, it's a toss up as to which is eaiser, depending on tool availibality and mechanical skill level. For instance, my arms wouldn't cramp because and the agravation of such a job wouldn't be an issue because, even recently, I have earned my living that way, so it's a way of life.

As far as installing the pan gasket, get a cork gasket and install it DRY, WITHOUT SEALER! And make sure that the flange holes aren't sucked in. If they are, hammer them so that they are flush with the pan. Also, a clean mating surface is mandatory.