I have committed to doing my own work on my 2007 Passat; just passed 100K miles, called the dealership for a timing belt service quote (with water pump). Had a minor heart attack (figuratively) upon hearing the price (even with discount) and also was told that idlers and tensioner are not included.
So, in the past I have only done oil changes, thermostat replacement, brakes, AC overhaul on my S-10. Also done an oil change on the new Ecoboost Flex. Have had Father in Law assistance / leadership on everything but oil changes. For reference I am an electrical engineer, so while not mechanically disinclined, fairly inexperienced.
I found a MkV GTI timing belt DIY online and looked over it with a buddy (mech E) at work to see if I could follow it and it looked like a lot of work but not at all impossible. I spent 2 days total, changed oil, wipers, rotated tires, changed timing and accessory belts, idlers, tensioner, coolant, etc. Took a major detour attempting to replace the thermostat but was stymied by a badly oxidized fastener, diminishing daylight and motivation, occasional misplaced critical tool (torx bits), and difficulty re-attaching very short hoses. Also the alternator was not as easy to reinstall as it should have been but I know the trick now. Glad I didn't break the cast aluminum.
I also installed a performance mod (my first!), ECStuning's transmission dogbone mount insert.
The jury is still out on whether I enjoyed the experience (this time I worked 70/30 with father in law rather than being helper monkey) but I know the job was done completely and completely correctly. I do enjoy having saved all told about $800 for my trouble. Also people who know what I did last weekend (neighbors and coworkers) are impressed, for what that is worth.
So now I need to get my own torque wrenches, jack stands, a floor jack, and a VAG-COM and I will be set. Also need to settle on the Bentley Publishers service manual or alldatadiy.com access. I have no experience with either.
Next scheduled projects are the 10K service for the Flex, 110K for the Passat, and eventually brakes, struts, APR Stage 1 with new cam follower, DV, and PCV mod for the Passat. By then there will likely be an exhaust problem, so may as well go stage 2.