Those beard DVDs will probably help. I haven't seen the varner one yet but I saw Billy I's 1 pocket DVD and it seemed pretty good. Honestly the best thing you can do for 1P when you're away from the table is watch real matches with efren or other top players. See their response to real game situations. Pause before they shoot and try to guess what they are gonna do, then see if you were right. If you weren't, see if you can come up with a reason why their choice was better. If you can't, post the situation on here.
It really is a game of choices, and if you can make the same choices as the pros, you'll get pretty good at it even if you can't shoot as straight as they do.