anyone have a tough time with omoplata?

If you can hold the position, you can finish it. Practice setting up the omoplata on your training partners and trapping them in the omoplata position while they try to escape. There are several different things they can do to escape, and you will learn how to counter all of them to keep the position. Once your positioning is solid, finishing the shoulder lock is the easiest part.
 
To finish the omoplata, my instructor teaches us to sit high on the arm and clinch around the other arm and try to put your chest on his back.
 
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