If sandpaper wasn't working sufficiently, and there is still a gloss to the surface of your tub, then you'll need to use an acid to etch it. Check your local hardware store or home improvement store for hydrofluoric or muriatic acid'. You'll want to be careful with this, follow all directions and be sure to ventilate the room.
Electrical: Much bathroom remodeling involves changes in lighting fixtures. Changing a light bulb is simple. Adding lighting to a new part cost to have tub reglazed of the bathroom is not. As above, if you are not a licensed professional, schedule an electrician for this part of your bathroom remodel.
Floors: Most bathroom remodeling projects include some type of floor work. If reglazing tub, toilet, shower, or sink are to be moved, you will need plumbing changes. New holes will be made in your floor. You may need new sub floors. This step will probably follow the movement of walls.
If you enjoy your work you'll never work a day in your life. I remember looking forward to Monday mornings sitting in Sunday school before church. I could hardly wait to get started on Monday morning on that new project I just got a down payment on.
Your contractor may or may not use a bathroom remodeling check list. If you have one, however, you can ask that it be used. It will keep costs in line with the budget. It will be your game plan. It may also get you back into your bath tub restoration sooner.
The process of installing a new framed-in tub can be fairly easy as long as you're replacing an old tub with a similar model. To start from scratch in a new bathroom, however, you'll need to start by framing the area. This includes adding 2x4s which are nailed into the wall studs on the back and sides of the tub called ledgers. After framing you can add the plumbing. Once again, when replacing an existing tub, the plumbing will already be there for you to use.
When you're tired of those same old bathroom walls, try a good cleaning and if that's not satisfactory, refinish or replace. You're not stuck with those walls. With a little work and a little cash, your ceramic bathroom walls can be, once again, a pleasure to behold.