The plumbing courses cover all the aspects that you will be required to deal with as a water line repair. You will be taught about the basic aspects as well as about health and safety issues and sanitation.
When you get to the house stand if front of the toilet and locate the water shut off valve. Should be down below the toilet on the wall. Just turn it off (righty-tighty) completely and flush the toilet. All the water should have left the tank, well at least most of it. If there is remaining water line repair get it out with paper towels or a rag. The important thing is that no more water came in. If it did then your valve is not shut all the way or not working and you need additional help.
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.
The location of a plumbing contractor is a key factor. This is because he or she will not only charge you an hourly rate, but travel costs will also be charged. This can add a significant amount to the final bill if the contractor has to travel from the other side of town.
One tip is to avoid hiring a plumber, who is a part or who is representing a company. They usually work on a commission basis. The company usually has a flat rate for every plumbing service and the plumber's commission will be added up to the company's charge. This is one of the main reasons why some plumbers charge you with a ridiculously high amount of money for their services. Opt for freelance water line repair plumbers instead. They work for themselves, so the price is usually negotiable.
Keep your hands clean and dry. Plumbing jobs get slippery, so it's important to work with a pair of sturdy gloves so you don't lose your grip and accidentally hurt yourself or break something.
Sometimes there can be complications of broken toilet flanges, closet bolts or rotted sub-flooring. If you find any of that in your situation, it will need to be repaired before reinstalling the toilet.