trail ride! trail ride! trail ride!
by this I mean do anything and everything that you would normally do in a calm and forgiving manner and also in any situation you would normally get into.
do not rush it and try, if possible, to not to punish for little things the first few times it is a new bit so you may be asking your horse the same but it is going to feel different so do not get mad or over worked if he does not respond how you should the first time you ask him to.
Good Luck! :)