If he is established, you should be able to make all of those changes all at once and let him adjust for 2-3 days afterward. If he is relatively new, I'd make those changes and give it a week. When I make changes in my enclosures, I do so during a spot clean and water changes or total clean and water changes because I'm already disturbing the snake. You can also make a change per week until it's set up the way you want it, that's up to you.
For your water bowl, many times it's placed in the middle of the enclosure and/or over part of the UTH to help humidity.
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