I had the dealer doing thousands of dollars worth of work (Nissan Corporate covered it out of warranty) when basically the entire airbag system shìt the bed at 80K miles. The steering rack was covered under a 3rd party warranty, so I had the dealer do all the work at the same time. It was purely a matter of convenience because I did not have the time to do the work myself at the time.
I never worked on my own car before owning the Z. But a couple years after purchase I had a ton of tools and was doing everything myself, including transmission drop and CSC replacement in my garage on jack stands. I had a lot more free time the first few years of ownership and taught myself a lot in that time. Believe me, if I could have avoided the dealership, I would have