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If you have hot water rads, it is totally doable, just a pain. You will need to drain your radiators, so it really should wait till the weather is a little warmer. the hardest part is unhooking the radiator and moving it. they are heavy! you might have to really soak the connection with WD-40 or something to be able to unscrew it. When you reconnect everything, you will need to bleed all the radiators to get the air out, starting at the top floor and working your way down. You might have to check them all a couple of times.
We had disintegrating plaster behind one of ours due to a leaky window. we repaired the plaster, repainted, and hooked the radiator back up by ourselves. you can do it!