[Omnipotent1]

A good trigger is important.
Most of my shooting is either standing and offhand, or sitting in a chair with my elbow on my knee for support. This more closely represents my style since I don't shoot from elevation any more.
You'll all laugh, but I found visualization helps me most. I can visualize a successful shot any time, anywhere; even without the bow in my hands, though having it in shooting position, making things (seeing the deer, picking the spot, hearing the sounds, controlling breathing, seeing the arrow hit, following through, etc.) as detailed as possible. Professional athletes use this technique and it works, at least for me.

Whether shooting a gun, shooting a vertical bow with a release or your crossbow... A good trigger makes average shooters' a whole lot better.. And good shooters, even better too.