Who can change the cylinder head gasket?

Hi,
I have a problem!
In my V8 3.6 L the cylinder head seal is over and licks strongly with oil. The good eight cylinder has not come through the TÜV... I'm just...
Now I wanted to ask if someone could change the cylinder head seal. I would need an experienced screwdriver in the Rendsburg area in Schleswig-Holstein.
Or can someone recommend me a good workshop that repairs it cheaply?
What will a new installation cost them with wages?

Thank you for any help!!!

MfG
Hauke