Do you have a tree? Hardest shots for me are the close ones under about 12 yd. or so. That takes some work to make sure I get limb clearance of the tree, my stand, and my leg. That does not take much space to practice, and you don't have to be that high to practice just shooting down. If you don’t have a tree or way to support a platform, then I would just go to some state land and hang a stand for practice sessions unless that is not permitted in your area. Just stay near the parking area so it does not look like you are out hunting. You may also be able to find a trad gang member with a good place to practice.