Alejandro is the best, most versatile plumber I have ever used. When I needed a new toilet installed in a guest bedroom, he also did a great job replacing the the damaged tile work around the base of the old toilet. When I had new countertops installed in my kitchen, he came up with a creative solution to a problem I had with the old gas line running to my stove-top. He is not expensive, a nice guy and a true professional.
Also, you might run into a problem where the shower arm is too short or angled too sharply for the shower head you bought. This can happen more with the wand-type shower heads and the wall gets in the way of the wand. You can solve this problem by making sure you buy a shower head that fits or installing an extension arm onto the main shower arm. You can find those the same place you buy the shower heads.
When a person has a blockage in their sewage system they often try to fix it themselves by adding an acid or a base such as Drano in an attempt to dissolve or dislodge the problem. These chemicals can get into the plumbers eyes when the sewage is splashed during the repair. The plumbers skin during the repair does come into contact with the sewage water. The owner of the toilet might not report to the plumber they have already tried Drano a highly caustic base .