Changing engine mounts with engine installed

Question that may be relevant for the OP, what's the best way to get the upper mount nut loose with it inside the mount bracket on the engine? I'm going to have to replace my pass-side mount here soon, rubber has a crack in it about halfway up.
I got all the nuts off in about an hour. Some you can get from the top and others from underneath. Apart from standard sockets and wrenches I used a ratcheting 5/8 and 3/4 wrench because they are good when you have limited room to swing it. I used a stubby 3/4 for the isolator nuts.

I also found some old Schumacher engine mount shims leftover from another project 15 years ago!