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DIY. wrench. Spanner. Ptfe take or lecture.
Then decide how you want to go about. If your going to do a few then drain the system buy some inhibitor. Change the valve. Flush some water in. Inhibitor added. If you have a towel radiator use that as your infillAlternatively you can do the snatch method.
musa
Changing non TRV valves to TRV valves is worth getting a professional to do right? (on a couple of Rads).