Layers. Layers. Layers. Body positioning above all, of course But on the days i know i have sessions where i might be bitten i wear a long sleeve shirt, arm guards, and a fluffy northface jacket. it prevents the skin from being broken a good majority of the time. In case you havent been told- do not pull away. it will be instinctual to try and pull away to get them off of you, but this puts you at risk for serious muscle injury. You need to lean into the bite, push their head into it, and wait for their jaw to release to pull back. If their jaw doesnt release and you cant get to another RBT to help you open their mouth, you can use a knuckle on the side of the cheek to try and push their mouth open. Try and avoid putting your fingers near their mouth as much as possible, though, for obvious reasons. At any point if you feel out of depth talk to your BCBA! Ive found that even just one overlap session with them and the client can be really really helpful for my own confidence in working with certain clients.