I was going to do a video on putting beadlocks together, but I was in too much of a hurry to get our Deadbox running.
Sometimes certain tires don't do well with certain beadlocks. But usually there is a spot where the tire fits in the wheel lip. Try not to stretch the tire at all. You want the tire to be as close to its free state as possible.
Get the screws started, just a thread or two. Check the tire to make sure everything looks good. If an area needs tugged on, stretch it gently. If an area seems to be too far out of the bead, try to poke it back in. I have these thin metal paint stirrers for my aibrush that I use, but I've also used a dull tweezer or screwdriver.
From there, I turn the screws maybe one turn at a time, in a criss-cross pattern. Repeat until you get them seated, checking both sides of the tire to wheel lip. If anything goes out of whach, back up 1 turn on the screws and fix it.
Hope this helps. I will try to get a video next time I do beadlocks.