Have a shop trim them for you. Remember one wrong cut and your hosed.
My advice on other skin issues.
Don't use the rubber strechy thing on the tip, They break and also make it harder to get through tree wells and other dips because they catch.
I don't use tail hooks, just cut it off 1 inch short of the tail then round the corners. I have only had them peel twice in 6 years.
Get glop stopper! Snow sticking to the skins sucks.
Get a can of glue so you can add more to bare spots
Wax your skis often so the skin glue doesn't stay on when you peel the skins off.
When going downhill stuff skins in your shirt mext to your skin. Yes they are cold and you will look funny but when your skins peel you will be stopped cold.