Jono , you sound like you are making it hard on yourself. First find the food source they are using. Second decide where the wind comes from most in that area. Then it's just a matter of finding the tree. Then deciding if you can climb or you need a loc on. We are lucky in the South. In most places there are plenty of climbable trees. It may be hard to understand, but in the mid west they are very few. they fork or are limbed out at a low height. Something I failed to mention is safety. Get a harness and use it. wear it during practice and get used to it. It is not a good feeling to be hanging upside down 20 ' up before daylight. I can assure you of that. Don't get me wrong, if there is a mistake. I've made it. HUNT SAFE