Western bridle: Undo the bit pieces, and slide it right off.
English- Remove the bit pieces, unbuckle the caveson, slide it out from the browband, and then slide the browband off the crown piece.
It seems difficult at first, but it's really not bad at all, once you learn all the pieces of the bridle.
I was in Pony Club, so I was made to take apart and put back together a bridle for a rating. Definitely learned a ton about all the tack parts in PC.