First - feeding in another enclosure is not necessary. There's people that do it for various reasons, but to prevent associating your hand with food should not be one of them. The majority of people on here feed in their enclosure. It's easier on the snake and I have no doubt it will make your first feed more successful. As long as the only time you don't stick your hand in there is to feed him, it is highly unlikely that association will be made.
Misting should be done if you're having humidity issues. He probably drinks at night while you're fast asleep.
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