As said before it can be done same day, I've done it. Have you decided if you're doing a glass tank or tub set up? Are there any items, tank, tub, heat, thermostat, hide boxes, etc that you can get in advance? As for feeding in or out of the enclosure I do both. If a tub is going to need a spot clean and water change or even a deep clean I'll usually take the snake out and feed in a feeder tub then put them back once the tub is ready to go. If a tub is fine and doesn't need any attention then I'll just feed them right in the tub.