When things drop, that you are not expecting, they can get lost.
So as you haven't done this before, a very small addition is to watch out for the big 'penny' washers when you take the bolt out at the rear of the tank. They are liable to fall when you lift the tank. If you have a nice clean, tidy garage to work in, that won't matter – but just in case...
As well as the electrical connections, I grease that bolt and the washers to keep long term corrosion at bay. You might as well, while you are at it.