feed in tank or another tank/tub?

[missi182]

Never feed your snake in its enclosure. This will make the snake think that whenever you open the enclosure they will be fed and you do not want your hand to be mistaken for food. Also this will make your snake tame because it will be used to the feeding container and associate going into the separate container with feeding.
If you feed your snake in its enclosure it may end up being agressive anytime you open it.

Nice to meet you Mikey, Welcome to the site. Think carefully about your reasoning here. When you feed your snake OUTSIDE the enclosure, your hands are STILL present. If you want to go that route, I could contradict with "well then wouldn't you think your snake being removed from his enclosure at all would cause him to go into feeding mode?"

Ball pythons are not stupid, so unless you NEVER put your hands in the enclosure with exception to feed, and your hands smell a great deal like a rodent, you are just fine to feed the snake in the enclosure. You actually stress your snake out a great deal removing it from its recognizable home where it can comfortably hunt and feel secure. You also run the risk of your snake regurgitating when moving it after it has just eaten. Regurgitation is very unhealthy for any reptile, and to risk it occurring for no real reason is just silly.

Some people are set on moving a snake to another area for feeding, and they can do so if they please. But until you have a little more familiarity with different husbandry practices, please don't feel offended if you are corrected.