I understand exactly. I'm having the same anxieties cuz this will be my first year bowhunting. Even in years past with a shotgun in hand and a deer out at 70-75 yards, Ive shaken so bad I thought I thought the tree I was leaning against was gonna come down. I think the only reason I got my first deer is because I used a tree to steady myself. If it would have been an offhand shot i prob would have shot twenty feet over him. Ive been practicing almost everyday for five months with my bow and i feel confident with my groupings, but I think thats all gonna go out the window when the first deer comes within bow range this year. I wish I had an answer on how to calm yourself but I dont think its even possible until after a lot of experience/kills.