This was one of the most important factors for me. I used to shoot at a range that had a camera on the target and a small tv at the firing point. Analysing shot by shot quickly became an exercise in frustration, then in temptation as I tried not to look at it between shots. Eventually I just turned it all off and it was much easier to get my head in the game. My eyesight was good enough to see some of the light coming through the card, so I just had to concentrate on my front sight and nothing else.
I used to dry fire at a dirty spot on the wall in my oldest boys room.. this was great practice as it was an indistinct smudge roughly the shape of a circle. I chose what my release picture was and just practiced practised practised.
If I sell this Walther Gold Cup LBP I have, I might purchase another Feinwerkbau 100/2/3 or maybe a pcp as my club have bought a compressor.