I agree with Prism - it took me along time to realize that the seam allowance is the key to getting the miters correct - it really depends on what your seam allowance is and that is the key to stopping and flipping the corner away then lay the binding down and start sewing again. I know that makes no sense - but keep practicing and watch videos - one of the best I watched and helped me the most was by Holice Turnbow - try googling it on youtube - he is a pro at binding.