I am going to replace my current 19 year old, rusted, 20 gallon Well-x-trol tank with either a 44 or 62 gallon tank. I'm also want to replace the pressure switch, guage, check valve and all pipping. I found the tank and parts on line for half the price the local pump guy charges. Is this simple job? Just pull out what is there and replace with the new? I know I have to make sure the tank pressure is set 2 lbs lower, or at 38 lbs for a 40/60 switch. Other than that, what else should I be aware of? Thanks.