FWIW, I just looked up the kit for the 2006 A4 2.0T Timing Belt, and BLAUParts sells the "Basic" kit for $189.95, and the "Enhanced" kit for $295.95. They also rent to tool kit to make the job far easier for a whopping $38.

I'm thinking a timing belt job on the OP's car shouldn't take more than five or six hours; even if the person doing the work has never done that particular job before.

 

I have been thinking about taking this job on myself. I think it is a bit itimidating since you have to remove (loosen) the whole front clip. I am thining a weekend with a buddy or two and just about anyone should be able to figure it out. I am undecided myself. I am the same guy that paid to have the diverter value replaced as I could access one of the bolts (didn't have the right tool).

 

Assuming you have the pins (I rented mine from BLAUParts), the sliding of the entire front clip forward is really easy and takes all of about twenty minutes.

 

It is not that bad of a job, just save the beer drinking until after you have fixed it and not during, I just did mine a couple months back and cost me about $500-600 in parts but that was timing and serp plus changing all of the parts with VW/Audi parts....