If you need immediate service from a plumbing company, you should find one that happily offers it to their customers. Some even specialize in providing fast repairs and replacements. If you think you need this kind of immediate help, you should learn what to look for in a local business.
As a Plumber you have done your time and got your trade certificate. It wasn't given to you because you had to earn it. You now have the right to make a fair and honest living from it despite the down turn in the economic climate.
Some bathtub valves do not take washers and therefore you cannot repair them. If you have a washerless shut-off valve that leaks it will need to be replaced. You will need: a propane torch, solder, flux, sandcloth, a wire fitting brush, a small section of copper pipe (most likely 3/4" I.D.), a slip coupling (again probably 3/4") and a shut-off valve. I would highly recommend installing a ball valve with a drain on it as opposed to a washer style valve. If you purchase a decent quality ball valve it will last a very long time.
A Trustworthy plumber will answer all of your questions. Good plumbers will provide you with references, and tell you how long they have been a plumber, and the type of guarantee they provide for their work (warranty.) As well, a professional plumber will offer emergency service for nights and weekends. You should be able to make contact with him or her in a timely manner. A professional plumber will also have all of the appropriate insurance such as liability insurance so that you are protected in the event of an accident.
Your septic tank has to be emptied sometimes, and there's no easy answer to when it should be done. It depends on the size of the tank and the (sorry to mention it) consistency of the stuff going into it. Basically, if the septic tank isn't pumped out regularly, it will cause you thousands of dollars worth of problems. Ask your Local plumber for advice on your septic tank maintenance.
Shower and Tub Problems: One of the common problems that arise at every home is that the shower head gets clogged with minerals from water. When your tank is not cleaned properly, the water waste gets clogged and you do not get water flow. In this case, you need to remove the shower head and clean properly. Also, drains get clogged often with hair, dirt and other wastes. Water flows towards your feet when you shower. You need to check out and clean the drains.
Most importantly, make sure that you set your foot in a reliable and trustworthy store which also offers great discounts or sales for you to be able to save.