There was a thread here some months ago written by someone who made it his practice to walk late each evening for a month or so into the quiet privacy of his backyard garden, where he would sit and practice positioning his gun in the most effective position (in his mouth?) before retiring for the night.
I think maybe a brought a drink or a smoke with him, and made it a not-unpleasant nightly idyll.
It seemed that the ritual practice lent the evening of his final act, when he was going to pull the trigger, a sort of calm inevitability. At least that's what I remember, and I believe he was successful.