If you want to move the tank safely, here is what you can do (my personal suggestion). First of all, I wouldn't move the tank back to where it was until the painted walls are dry. Now, I also had to move my 30 gallon tank a while ago. Here is what I did successfully, and thus what I'd also recommend to you.
First, I took a bucket and filled it to the top with the tank water. Next, I hung my filter on the bucket, so that the filter could run while I was transferring the tank. Meaning, that all the bacteria in the filter could be saved and I wouldn't get any mini-cycle after the transfer of my tank. Then, I netted my fish and put them in the same bucket with water and running filter.
I emptied my tank to the point where there was little water left on the bottom of the tank. The emptied water was saved in buckets. BUT ... you don't have to save the water if you don't want to, and if the new water you'll be adding will have similar parameters to that of your tank water. Here is what I mean: if you tap water pH and nitrate are very different from the pH and nitrate of your tank water, the fish may get a pH and/or nitrate shock when put in a totally new water that has very different parameters. But if your tap water is similar to or the same as your tank water, you can fill the tank with new water after the transfer. What you can also do (if tap and tank waters are very different) is to save only half of the tank water. Then, when the tank is transferred, put the tank water back in, and pour new water in - though not too quickly, in order to avoid any shocks to fish.
OK, so what I did next was I simply carried the tank to another room with the help of another person. We took the tank by its bottom (never lift the tank by its upper trims!). Then, when it was in place, I filled it* back with the saved water, put the filter back on, and put the fish back in. And it was done
If you'll be keeping the tank in the same room that will be painted, do put something over the tank, so that no paint gets into the water!