You don't want to just buy boots in your size. You need to try them on and find out what fits. Despite how well you think you might get in a short period, your experience will be lousy if you don't get the right boots. Your board is not going to be the sweetening factor in hire much fun you have. Plus what you want from a board will change as you get better. Demo boards instead of standard rentals a few times before making your purchase.