Changing engine mounts with engine installed

I've got a floor jack under the oil pan and the front end comes up as I jack. I assume at some point the engine will separate from the mounts? I might try and get a long pry bar in between the mount and crossmember but its awfully tight in there. Perhaps I should try jacking one side at a time to start? I wish I was lifting from the top end as I don't want to wreck the pan.
Yes it will. Hopefully you put a 2x4 under the oil pan. It spreads the load so you don't damage the pan.