I recently switched out both my mare's bits. I just put it on and rode per usual. I'd say as long as your horse obviously isn't liking a bit, go ahead with your ride per usual. That being said, my one mare does "act up" when I stick a new bit on her, but that's just her testing me really, so generally I push her through and by the second ride she's fine. Though for you, the only thing that's changing is the size of the bit so you really shouldn't have any issues. Warm up like you normally would and go from there.