I want to replace the T&P valve on my gas water heater since it is dripping water all the time. I talked to a couple of people such as my friend and a salesperson at a Home Improvement Store. They said I need to call a professional to do the job. I researched the subject on YouTube and find it can be done by myself. I do not know the reason why I would need to call a professional, which is expensive. Can it be done by ourselves?
I know the basic safety procedures. For example, I need to shut off the water/gas and drain all the water to reduce the pressure in the tank before doing anything. Are there any other safety concerns? I mean if it too complicated I will call a professional but I want to make sure that I really need them.