Very very easy to fit in my experience, just requires a gentle touch as opposed to brute force.
Basically behind the light cluster you will see the bulb holders, if you twist them by 45 degrees or so the bulb will simply pull out of the cluster, then simply change the bulb and pop back in and twist.
The tricky part is putting the bulb holders back and getting them 'locked' into place. The bast thing to do is to take a picture on your phone to note the orientation of the holder before you touch it as because of the fitment it will only lock in one position.
Seriously though, its a five minute job.