Spend some time on 2 arm swings and 2 arm high pulls with the 2 pood bell -it will help your nervous system get used to the weight. And when you go back to 1 arm versions, really emphasize the hip thrust, and fight the way the big Beast tends to pull you forward.
My left arm still has problems with the mechanics of the one hand snatch, so when I practice using the bigger bells, I will sometimes assist with the other hand at the top of the lift/flip - I grab the inside handle with my right hand and put just enough assistance on the bell to keep the thing from hurting me. Same thing with miltary and side presses with the two pood bell if me left arm runs out of gas.
There is no substitute for good technique, but at least I am not getting killed while I try to learn it!