A separate feeding is not necessary. I, along with many others here, do not use a separate container to feed. I have six ball pythons and two boas and none of them have ever shown so called cage aggression. If anything, moving them back and forth is more stressful on them, plus it is a good time to get bit while they are in feeding mode. I don't worry about them ingesting substrate while eating. From what I have seen anything stuck on the prey falls off while the snake works the prey item into its mouth. Plus, I don't think they have someone with a tub lined with paper towels available in the wilds of Africa to make sure their prey stays clean while they eat. LOL
You will do fine. You are already asking questions which is great!
Good luck!