Please note that this task is not one that can be done quickly and you should think about using a professional service like Falconwood Plumbers to do it for you if you are not confident enough to take it on. You can remove individual radiators without having to drain the whole of the plumbing system. Make sure that you have plenty of old spare rags to hand for mopping up any spillages will definitely happen. This should include a bowl of decent size. The radiator water is very dirty so, if possible, roll back any carpets or floor coverings, particularly at the start point. Shut off both the valves on the unit, turn the nut on the lock shield valve clockwise to close with a key or an adjustable spanner. Make a written notation of how many turns for when you open it again. This is important. Unscrew the cap nut that keeps the hand wheel valve or lock shield valve attached to the adaptor in the end of the radiator. Place the bowl underneath the joint and open the bleed valve slowly to let the water drain away into the bowl. Keep doing this until no more water can be drained. Unscrew the cap-nut that keeps the other valve attached to the radiator, lift the radiator free from its brackets, and drain any water that remains. If you’re going to decorate the wall, unscrew the brackets. To replace the radiator, screw the brackets back in place, then rehang the radiator and tighten the cap-nuts on both valves. Close the bleed valve and reopen both radiator valves as carried out by a Falconwood Plumber. Bleed any air from the radiator. Shut the valves and finally unscrew the nuts and lift the radiator from brackets. “