I changed the oil pump with just raising the motor off the mounts. Tall jack stands on the front, hoist on the motor, and you'll be good. Actually pretty easy, if you have a mess down there from a long term oil leak I'd probably get under it at a car wash and blast the living hell out of everything down low. Use some degreaser or Simple Green and get it off before you get under it.
Also, get a single piece gasket. I have a felpro like the below, reused it many times.
Hopefully the old gasket won't be a PITA to remove. Oh and drain all your oil 1st.