Easy job so long as you've got a socket big enough to get the steering wheel nut off. IIRC its 23mm (have a search to find out).
Get a new stalk off ebay, but be careful to buy the right version as the MFA thingy differs on some models. Alternatively whip it off and give it a good clean with WD40 and see if it clears up - Mine did and lasted for a few more months, then broke altogether.