The thing that I always try to do is watch the birds fly into the roost. After it gets dark enough so the birds won't fly down, I will go in and set up a blind as close as I can possibly get to the birds. 9 times out of 10 they will fly down in the same spot they went up. And then I will get there at least 1 hour before it starts getting light out. I've shot a lot of Toms this way. But if there is a softwood tree that I can climb under, close by, I take that route instead of the blind. Good luck.