welcome to AA!
we're glad to have you here
as far as water changes, you should look into getting a Python (no spill n fill or something like that). that way you can avoid the whole bucket brigade deal. assuming you would be able to reach the faucet and inside the tank, it's something you could probably do alone.
there are also some great DIY tank stand build threads on here. you can use the plans and just make them shorter so getting inside your tanks and viewing will be easier and more enjoyable
(that is... if you are wheelchair-bound