Separate them at first, make sure you place the cages far enough apart where they can't grab at each other's tails. They usually say quarantine, but if they're coming from the same place I don't think that'll help at all. Take them in to the vets, in separate pouches, and make sure they're healthy. Let them adjust to their environment before handling them too much (you probably know this from learning about how to bond with them). After awhile, you can switch their cage things to put the scent from each glider into the cage of the other. When you carry them, put them in separate pouches near each other. It may help to make sure they can't actually see each other at first, then slowly turn them around to face each other. I've heard people taking them into rooms or tents for playtime together, where you can get to them if they're fighting and keep a close eye on them. I've never bonded two gliders, but there are many threads on this website explaining how to do it and videos you can find through google too. Other people can probably give you a more detailed explanation. I think there's a few different ways people introduce, but ultimately it's up to the gliders to accept or refuse each other. Good luck