I much rather do the work myself and if I'm lost, I will seek out help from a friend or advice from an awesome forum like this one.
You learn quite a bit about your car and general automotive fundamentals.
In my opinion, the Z34 is still new, so the populous of DIYers is not that large. I'm sure you'll see more DIY threads once the Z34 gains more popularity and the initial cost (i.e. buying the car) is not too high.