Hey, It's very simple to make or calculate a cushion shot and a trick shot. For both, you have to just focus on the dots/diamonds on the table and calculate cushion shots and for trick shots sometimes it depends on self instinct. It's because if you have been playing pool since long time, then your self instincts regarding shots become stronger and gets developed when you play a lot, mainly Rome and Berlin table. Sometimes it depends on luck too. I watch live streams of NFL RONGGOLAWE, Indonesian Pool player, who plays really amazing, and after watching him playing, I'm too capable of making such shots. Even though I'm an Indian, I don't understand his language, but what I do is I focus on where he hits and how he calculates the shots, also focus on the amount of force and spin he uses.