uug197h

Showers are easy but as you say not part of the course, I did a course with ppl in york they had some bays with showers in if you had finished in the bay you where using and had some time you could start another installation or go on to one of the showers, but remember that electric showers need a part p electrical instalation Certficate to do that course is another £1500 thats £600 +vat and another week of work or 2 weeks if you need the basic training first.
If you can get hold of 1 or 2 second hand showers (they don't need to work) put them on some plywood and plumb the pipe work in, if you whnt to hide the pipe work work from the back and drill a hole for the pipe to fit to the shower this will show you how easy they are, with being a tiler you don't need to work with a plumber just removing the bathroom suites will get you started