You can already turn a wrench and as others have stated, a lot of mods are very easy to do yourself if you have a basic knowledge of tools.
Maybe a couple of searches for things like window resets, ecu reset to get familiar with some of the more modern stuff.
Here is the DIY section for you to root around in and see whats involved in a lot of the mods.
DIY Section (Do-It-Yourself) - Nissan 370Z Forum