Dropping the oil pan.

There's a "how to" over on dot org. Check the Articles.

It would be a pain in the butt in the car, if you can do it at all, and probably won't seal.

The only good way to do it is upside down on a motor stand. Use Doc's method, and you'll be fine.

Sorry dude! If you want a good seal, yank the engine.

Are you sure it's the pan? Check the alternator bracket bolts. One that goes into the block goes into oil. It should have sealant on the threads.

CJ