Lane, I use an ATV jack with 2 parallel support points that I got from HF. On top of those supports I use an old boat cushion to contact the sump. This gives you support and also allows you to wiggle the engine a little bit to get it off the bolts and get by the frame rails. Then I placed a scissor jack under the transmission on a creeper or furniture mover and loosened all the bolts holding the transmission in place. Then I pulled it to the rear with a heavy duty ratchet strap using the frame in the rear. Just enough room to slide in the new mount. Not a 5 min. job, at least for me.
Oh yeah, don't forget to disconnect the the shift rod coupler. Duh. I have a swing axle so your milage may vary there as well. Best of luck and don't pinch your fingers. Also, this would be the time to replace the rear mounts, but you knew that.