Siaga's been having serious issues with it, not wanting to take the bit and seeming uncomfortable when he's got it in his mouth. So today I altered the bridle a bit, so that I could easily clip on and off the reins. This way, I can take the reins off and leave the bridle on, under supervision, obviously, to help him get used to it. I also plan on finding a way to get him to enjoy taking the bit, such as peppermint flavoring or something.
Eventually he needs his teeth floated and might need wolf teeth removed, but after that saddle and everything, I have a bit of recovering to do on my bank account and this will have to wait a while.