No need for apologies!
They should fit snug at the ankle, and have plenty of "wiggle" room in your toe area.
If you want to get them "molded" to your foot, try submerging them into scolding hot water for a few minutes, use a nylon sock or panty-hose around your foot, and slide the boot on for ab. 5 mins, if you try to stand on your toes and heels to create some space, that helps too.
For the most part, the binding should fit just like any other, and overtime it will eventually mold to the shape of your foot any-who.
Hope this helps!