The plumbing courses cover all the aspects that you will be required to deal with as a drain leak. You will be taught about the basic aspects as well as about health and safety issues and sanitation.
It water line repair is advisable to speak to neighbors and friends regarding the same. If any of your neighbors or friends has had a plumbing emergency and has been happy with the plumber they engaged then it is best to contact the same plumber. Family may also be of some help as far as recommendation is concerned but neighbors are a better option because they will give you details of an agency in the same area as you.
After you have the stems out you should be able to find the washer on the "inside" end. If it is nicked, torn or brittle it is likely the cause of your drip. Even if it looks brand new, go ahead and replace it. You've already come this far. You can get replacement washers at almost any hardware store. Sometimes you may want to replace the whole stem, especially if the handle end is stripped out. It's best to just take the stem with you to the store and see if you can match it up. Most Do It Yourself stores have replacement stems for many popular brands. If your valve has a center diverter valve to switch the waterfrom the tub spout to the shower head the same process applies. Many times it is easier to replace the diverter stem than to repair it. This really depends on the design of the stem.
Getting advice from someone who has not made any money online is like asking a plumber to shoe a horse when they have never done so. Why in the world would you do this?
Be certain that the bathroom exhaust fan vents to the outdoors, not into the house or attic. If the exterior vent dampers don't operate properly or water line repair don't seat well have them fixed or replaced.
Plumbers should always have a durable and long lasting ventilation system ready for any job. Having clean air in ready supply can make many tougher jobs go much more smoothly and will cut down on the risk to the plumbers considerably.
Bottom line is that it is now very easy for even a desk jockey to fix his own pipes. Go by the closet home improvement store on your way home. Pick up some of these fittings and impress the wife with talents that she did not know you had. You may even get brave and do that small plumbing project that she has been begging for. Now you can use these fittings to cut into that water line to run that new outside faucet or hookup that water filter yourself. With the push type fitting plumbing has been made easy enough for anyone to be able to do it.