If his mouth is open he is probably thermo-regulating(fancy word for cooling off) Just approach him gently and scoop him up supporting his belly as the above poster mentioned. Just a note.If he's anything like mine,if he feels he's not secure he may whip his tale,just talk calmly to him and steady him and he should be fine,wish I was there,I could pick him up calm him and hand him to you. Take it slow and easy,why before long(If you can get him snuggled) you'll be on here talking about how much you love snuggling,believe me(I hated reptiles and wouldn't touch one for years) they are ADDICTIVE.