hi rosie, they will be held on with a small sping clip which is usually built into the winder handle if you prise the handle as far away as you can you might just be able to see it.
when i remove door cards i use a small piece of bent coat hanger like a large fishing hook if you like, hook this on to the clip and pull it you should then be able to remove the handle
not all cars are the same but a hell of a lot of them are this way, give it a go
simon, December 2004