Very good info from Lt. Dan over there!
The tank is totally up to you, but if you have an all-glass vive I will say they probably prefer more clutter - especially the hatchlings. If you only have the one snake, it probably won't be too much work to clean every month, so if you want to go all-out I'd say go for it
I have two snakes and I do with both of them; it's pretty exciting to watch them explore.
I also worried about their changing environment. I change mine around every time I do a full cleaning (about once a month) and they don't seem to care. In fact, they explore quite a bit. When they're done exploring I find that they go back to their normal, lazy selves. I also use the same decor for each snake, so although clean it is familiar to them.
Your snake *may* prefer your hand over someone else's - I find this is especially true when introducing a new person, and they just won't go... but every snake is different and will respond differently to people, right?
But I advise NOT to hand feed! You will find a method that works for you and your snake, whether that's in a container, in-vive, with tongs, or not. But unlike lizards, snakes do not have the "sense of mind" to always distinguish you from food, especially if you SMELL like their food! They get into what's called Feeding Mode - you will see it. It's really cool, actually.
Anyways, I hope everything goes well for you and your new addition.
As an added tip, try not to worry about everything
most of us do when we get new snakes - me included.