Welcome. Nice selection. First of many I'm sure.

If the bracelet has pins vs screws, look very closely at both sides. If one side is ever so slightly smaller than the other, that is the side you want to push from. This type of pin is either a tappered or a cotter pin. Should push thru to the other side.

If you can't resize it, wrap your wrist with an Ace bandage and tell everyone a good war story.