It takes a little work but shouldn't be to hard. Put it up on jack stands first. Then remove the steering drag link, unbolt the crossmember, remove the starter and drain the oil and you should be able to remove the pan with the engine still in the car.
The rear main seal is a little tricky to do with the crank still in the engine, but can be done. Just make sure you put the rear main cap back on properly and to the correct torque specs.
Your best bet is to get a shop manual for your specific year car and go over and understand the proceedure first before you start wrenching.