Do sugar gliders claw an opening into whatever appendage they can find, usually your arms or legs, and then?

They don't tend to be aggressive, if that's what you're asking. They have sharp claws to hand on to things, and may unintentionally scratch you as they take off or land on you, but I haven't seen any do it on purpose or really injure anyone. My uncle had a pair that would glide from/land on the tops of furniture or people or the cat and never did any harm.