Yes, hang radiator first then cut pipes to fit. If you've not taken a radiator out before be aware the "water" inside can be black. After draining the system there will be, depending how old the radiator is, black gunk in the bottom. So when you disconnect the rad from the valve make sure you've got a container underneath to catch any drops and turn the rad upside down (making sure bleed screws are tight) asap before you carry it out of the house.
Can change the pipework provided an airlock has been set up.
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