Head gasket on 1999 Audi A6 Quattro

I just replaced my thermosta and water pump but it's still heading up. I need to put a head gasket on it but how can I find out which one to replace and what is the step I need
to replace the head gasket. Im a unexperience mechanick.

Asked by for the 1999 Audi A6 Quattro
When replacing the head gasket on a V6 engine, you should always replace both, even if only one is blown, period.
You should get this diagnosed, it may not be a bad head gasket, unless you have already determined that.
This is not a job for an inexperienced person, so I highly discourage you from doing this yourself. But if you must, then get the repair manual from Bentley Manuals:
Read the instructions before performing this job, then read them again. Get the appropriate tools for the job and hope that you don't create any new problems.
I can't say it enough, you should take this to a professional!
1 more answer
you should always replace both gaskets because if one is bad the other one is going to go soon if it hasn't already.Just good practice to do both of them at the same time.I mean if you are going to be in there anyhow you might as well do both of them!! you will have a better chance of it lasting you for a longer time this way.