I would like information on steps to remove bathtub and install pre fab shower

This is a fairly big job but can be done if you have the right tools and a little bit of time....... Depending on the existing tub material (cast iron,fiberglass, tin type ). You will want to remove faucet trim(handles,spout) first. Then the over flow plate on tub,as well as drain in the bottom (this will require a drain removal wrench or pair of needle nose pliers and screw driver, and some strong arms).After this is done remove tub unit , if the unit is a cast iron unit a good sledge hammer will work as you will need to break into halves to remove unless your trying to save tub and provided you can then get the unit out the door in one piece...... Caution, protect body and eyes in this process, flying pieces of cast iron can do some damage to body......cutting tub will take several blades and take quite a while to do......The next step depends on the location of faucet and if you are replacing the tub faucet or going to use the existing faucet.... I would recommend a new faucet because if this is going to be a shower only you may want to raise the faucets so they will be easy to operate without having to bend..Depending on the model pre-fab (two piece,three piece) unit you wish to install you may need to prep the drain to make sure it will fit your new installation. Let me explain... most tubs have the drain located at the right/left end of tub and the showers are located in the center of the unit thus leaving you to relocate the drain. If house is on slab it means a little jack hammering the concrete to provide this, if the floor is a conventional it means re-routing the drain to the center.......once all this is accomplished you are ready to install unit base,connecting drain. Next you need to get the faucet located to the right height or be able to get to the back side of the shower and remove the existing faucets and replace them after you install surround.....turn off water supply before removing faucet..... A sturdy surround will make for a less involved support system around shower area.Be sure to leave enough space between studs for faucet attachment. Sounds like a lot of work and it is but after its done you will have a great bath shower..... hope this was helpful.... sorry this only dealt with the plumbing aspects of the job......