I have determined that the Well-X-Trol 20 gal. pressure tank that I have has "kicked the bucket" after 17 years. What I need to know is how difficult is it to install a new one? I am a 48 year old female and am pretty good at doing repairs around the house but I don't have a whole lot of experience with plumbing and can't really afford to pay a professional to come out to replace the tank if I can do it myself. Any help you nice folks can give me would be greatly appreciated.