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I did this recently on my Audi A3. The worst part was that the boots were seized to the plug so they separated at the electrode. Now I know they make a tool for that. I hope the MB is easier.
 

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yes boots will be a little tough, just need put some power and the key is to put that special electrical grease between spark plug and boot, os it will come out easier.
and most important, before unscrewing the plus to blow out all the dirt that might got in. you ll need air compressor to do so.
dit job all the way.
C
 

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Just had my GLA45 (still under warranty) serviced at 49600 miles. It was the A3 service. They did the spark plugs for a paltry sum of $374.45. The stealer-ship price for the plugs was $24.60 each. Labor was $276.45 which is 2 hours of labor at my speakership.

I know many of you will say its foolish to to the service at the dealer but while the car is under warranty I do the regular maintenance there so in case something catastrophic occurs, I have the relationship.
 
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