ETB and GTP are generally more "fragile" especially as babies. If you do have to uncurl your bp do so gently, basically no sudden movements, and don't try to pull the snake off of whatever it is gripping on to. Yes uncurling them from a chair may take more time but it will keep you from injuring your snake. Gently uncurling a bp will not hurt the snake. Possibly make them annoyed but it won't cause them any physical damage. Defiantly don't try to pull on the MBK as they have a much more slender build that a ball python and will be more susceptible to getting hurt. It you don't want to keep uncurling them then just handle them in an open space where they can't grab anything.