Replying to Is it safe

hi ns I just got new boots that still fit on my old bindings so I was just going to adjust them slightly my only question is this safe I put my boot into the toepeice and just slid the heal peic into place, I wanted to take it to a shop but my dad says he knows how to do it because 20 years ago he worked in a shop, when he first did it though it was obviously wrong so I fixed it, my dad is stubborn so he won't go to a shop what should do