I am the go of hellfire and I bring you...

So I'm fitting a carpet in what will shortly be Hannahs room. Because I'm naturally gifted at D.I.Y. And the door is going to catch. Unfortunately its an old plank door who's hinges are solid paint. So even if I could get it off I'd never get it on again. So how to remove 5mm from the bottom? I know! I'll use my angle grinder. What can go wrong.

Well. What can go wrong is that the door catches fire. Just waiting for the smoke to clear and its on to plan B.