I don't know if this will help.. but what I do on a western saddle when I am cinching it up...
I do my first loop by running the latigo strap through the buckle end and make sure the saddle is in the right place before I pull it through the top buckle on the saddle.
I do as many loops as I can without tightening a lot.. then after I have done about 3 or so loops, I reach under the loops till I am holding the first at the bottom buckle and pull up and away as slow and tight as I need, then without letting that strap get slack, I pull the second loop strap up and away. I keep doing this until I am done pulling them all tight then I tie the latigo up until I'm about to get on.. then I finish tightening each loop again until it's tight enough to stay in place but comfortable for my horse.
But the main idea is the first strap determines how tight the latigo is on the horse, the other straps just enforce in my opinion. But always hold the loop at the bottom and pull up and away like you are hoisting up an anchor :P
Hope that helps. Just make sure to watch your horse's reaction. Go too fast and it will be very uncomfortable and may cause skin to pinch or fold.. so walk them a few steps or stretch their front legs before mounting up.