OK. Just so you can see what I am doing here is a picture. As you can see there is a lot of the extra strap left over. I start the whole procedure by strapping the front of the ankle, throught the inside ankle strap and then through the toe hole and back to the ankle on the outside. How much do I trim? I tried the crampons on my ski boots (to try and simulate plastic mountaineering boots) and if I trim it to suit the ski boots, I still have too much webbing for the leather boots.