You have to have special fixtures to hold the engine while you are removing the pan. It is not an easy project. If you want to attempt it go to a parts store and get a shop manual on your car.
It has been a while since this answer had been posted but I came accross this post that talks about this issue and how to make a support from wood for a "do it yourself" kit.
http://www.clubgp.com/newforum/tm.asp?m=2546391&p=4&tmode=1&smode=1
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"G"
Did this not long ago with my 98 Grand Prix using a transverse engine support bar. It is still very difficult and requires disconnection of the forward (RH) engine mount and lifting of the engine slightly to get clearance. It is worth taking to a reputable mechanic to have done--not a good do-it-yourself job. Also, there is a GM S/B out on this now for installing the pan with Permatex "Right Stuff" type caulk sealant (not the silicone stuff). Simply installing a new integral windage tray/oil pan gasket probably won't fix your leak. GM just did the gasket twice for me while the car was under warranty and it never fixed it. By the time the S/B came out, my car was out of warranty and GM wouldn't help. If you go to a mechanic they should be able to get this stuff and use it--all NAPA stores carry it.
This of course also applies to 2000 GP's. I just found this out when my mechanic called to tell me it was $428 to replace a $1 gasket. I had no idea it was sitting on the engine cradle.
trans fluid
it can leak into engine compartment as well as interior of car. depends where it is leaking
Coolant leaking from the pump shaft.Engine overheating.Noise coming from pump.Coolant leaking from the pump shaft.Engine overheating.Noise coming from pump.
Determine the origination of leak and repair Could be transmission cooler line, seal, etc.
antifreeze leaking into the engine base. a cracked clyd. head or blown head gasket is probable cause
Probably engine coolant. The heater core is leaking coolant.
freeze plug has blown out or leaking
will a 94 grand am with a 2.3 engine work for a 98 grand am with a 2.4 engine
It would be a good thing to see where it is leaking from....
Sounds like the heater core is leaking. If confirmed, it will have to be changed. In the meantime, make sure the coolant/rad. is topped up. You really don't want to over heat the engine.
Between $50 and 2 grand based on where the leak is located.
The cost would depend on where the engine is leaking from. A leak from the main seals is far more expensive than a leak from a gasket.