we removed ours and it wasn't too hard and I'm really not that good at diy - just make sure your thermostatic valve is working (or replace it for a decorators cap before closing the valve). We spent a good hour waiting for the radiator to drain before realising the valve was still open
As in spring/summer? If so, yes it can wait. We have a conventional system boiler with thermostatic valve one side and drain off the other.