It's a quick and easy job, no need to ask a garage for that.
1. Disconnect the battery.
2. Undo 2 screws behind the steering wheel - that will losen the airbag, so you can remove it
3. Before completely removing the airbag, disconnect it from the wire first. It just pops out from the back of the airbag.
4. There will be a 24mm nut that holds the steering wheel in place, undo that and pull the steering wheel off.
5. Put your new steering wheel in place and do the reversal of everything.
Remember to align the steering wheel straight, before starting to do anything, so once you put the new one, it will be straight.
Also before reconnecting the battery, put the key in the ignition and turn it to "ON". This will prevent the airbag light from staying on.