I hate the feeling of paying someone to something but only to second guess on whether they've actually performed the job or whether they've performed the job properly.
I had to service my mum's Polo over the week (2 year service). I was quoted ~630 at VW which included the brake fluid flush and pollen filter replacement. I called a few VW specialists and was quoted ~550 which isn't really that much cheaper.

In this instance I decided to do it myself and forgo the remaining 11 months warranty (the car has 18000km on it in 2 years, so its very unlikely that anything engine related will go wrong).
Repco had 30% off storewide so I bought Penrite 5w30 Enviro+ for $60, Castrol Dot4 brake fluid for $10.
Ordered a Mann oil filter $16, Mann Pollen filter $26.
All up $112 and 1.5 hours of my time on jackstands which included topping up the very important washer fluid and checking suspension components/tyres etc.