In case you want to become a local plumber through apprenticeship, you will have to approach the local plumber's union, who can help you to find a professional plumber willing to hire an apprenticeship.
There are two, one on each side of the toilet, closet bolts which hold the toilet to the floor. If there are caps over the bolts, remove or pop them open. Using a small crescent wrench unscrew the nuts from the bolts. Alternate side to side when unscrewing this will be much more important when reinstalling the water line repair bolts but alternate anyhow.
The con to time well spent is only if the fix or installation works. Suddenly, when a pipe is squirting water or the dishwasher is leaking all over the floor, that time seems wasted instead of well spent. Now your time is wasted, plus you have to pay for a professional plumber to come over and fix the mess. That time could have been spent doing something else, like golfing or swimming or gardening.
Dirty waste water, after all, leaves your house following the law of gravity. Waste water goes downward to the sewer or septic tank, nice and easy. Behind this simple rule is the multitude of vents and traps to keep the process of waste removal possible. Vents allow air to fill drainpipes, precious air that allow waste water outflow. Traps are those curved S-shaped sections of the pipes under the sink drain. Traps perform a crucial role in forcing most of the water through the drainpipe, but leaving some to seal the area and prevent sewer gas from backing up.
The water line repair most likely damaged your electrical outlets and lighting fixtures. Have a qualified electrician come in to evaluate and repair the electrical.
The work area should always be clean and free of trash and clutter. The cleaner and less clutter there is in a Plumbers' work area, the better able a plumber will be to make sure that his job goes as smoothly as possible.
Then, you can take your new shower parts home and reinstall them in the inner assembly. It is very important that everything be aligned properly and tightened to prevent leaks. Beware of over tightening, however, since this can also cause problems. Once you are sure everything is installed properly, replace the cover plate and turn the water back on to test your repair work. With a little bit of work, your do-it-yourself shower repair project can be a success. It does not take an expert, just a little effort and know how.