I think the best way to get it all down is to set it up I'm sure many have had different experiences in maintaining their husbandry in a tank so yours may differ and writing everything down is a great idea but id say te full proof way to know for sure is to go through it with it setup. But a medium dish may help and as far as misting i just misted down into the bedding but of course some water will end up onthe walls. What you can also do to help is a humid hide with spahgnum moss (spellcheck?)... I think you could also use beaked moss (correct me if I'm wrong). You could also put the water dish patrially above the heat pad as well and cover the screen top with foil. And tweak it all from there.