Both ski shops (independent and box store) in town are out of the size boot I need for my daughter. I can get the boot she wants online but then need to adjust the bindings. She has the typical kids skis with the sliding adjustable bindings. The independant charges $30 for kids binding adjustment and the box store charges $10 (not sure why such a difference). I have watched multiple videos and instructions on how to calculate and adjust the DIN and read what posts I could find on here. Is this something that I should be able to do or would you leave it to the experts.