To the OP: I agree with what 200xth just posted above... If you kept a snake for a long time before and fed in the enclosure you housed him in, then do what you did then. I have used both methods (I fed my juvie sand boas outside their tubs to avoid ingesting substrate, but currently feed all of my snakes inside their tubs).
If you are concerned about cage aggression, look into hook training. Purchase an appropriately sized hook and before you handle the snake, use the hook to stroke / wake the snake up. Never use the hook at feeding times (only when handling) and the snake will become conditioned that the hook= handling and no food, therefore, the snake will snap out of "food mode" and be easily handled. I have never had a food-aggressive response from any of mine except when mice / rats are in the room or they've just fed... So this may not be an issue for you. Most BP owners that I know don't have to use hooks.
The decision to feed inside or outside your primary enclosure is up to you. Both methods have proponents and credibility in different circumstances. As I said earlier in the post, I've done both. Now I prefer to feed in primary enclosures as it is helping my more finicky sand boa feed (moving her to a feeding tub was apparently stressing her and making it harder to get her to eat) and it also makes things easier with my boas, which are much more aggressive at feeding time.
If you do choose to feed in another container, move the snake back within about 30 mins of eating so that they can get on their hot spot and start digesting. Without proper heat, they will not be able to digest properly.