I have a boiler system in my house that has two zones (one for the first floor and one for the second). Each floor has two loops (one east side of house and one west side). There is air in the line on one of the loops on the first floor but there is no way to shut the water off to the other loop so I can bleed the air out. I am told that I need to install shut off valves for each loop. I'm just looking for some advice as I have never done plumbing work in my life. Is this something a complete novice can do or should I suck it up and hire a plumber? Do I use ball valves or gate valves? How tricky is cutting the pipe and soldering the new valve? Help please....