I hung my engine with the top two bolts with no rubber mounts. I then installed the bottom bolts with the rubber mounts and lowered the engine so the weight of the engine on the top two bolts pivoted and squeezed the bottom ones enough that I could get a nut on. I then lifted the engine, took out the top bolts, put in the rubber and lifted with it pulling back slightly so the force of lifting compressed the rubber enough to get the top threads started.

Hope that makes sense and that it helps!