Completely full with substrate and decor....a 5 gallon is pretty heavy. I don't know exactly how heavy, I'd imagine it varies depending on what all decor-wise you have in it and whatnot....
Before you move it though, why not just drain it as much as you can with a gravel vac into a bucket? Pick it up, bring it into the bathroom, rinse things off, bring it back, set on the shelf, then fill it up again. I do this with my smaller unfiltered tanks even....I've found it a little easier, especially because I'm a small person, to carry everything this way even if its a couple more steps. Also, I've personally found water doesn't slosh everywhere too much this way....its a little less messy. xD
For an unfiltered 5 gallon with no live plants, I'd say one week a 50% and an 80-ish%, and then the next week a 50% and a 100% should probably be sufficient. That sounds about right to me at least.