order: timing belt, fuel rail/injector upgrade and ebc/boost gauge/misc other gauges. Timing belt, and fuel rail seem both very intimidating to me. Boost controller my be something that I would feel more comfortable tackling. Although, I suppose you have to get started somewhere. Really want to learn, just don't want to destroy my Z, I get more enjoyment out of that car than I'd imagine most people do who own cars 10 times as much :)