Welcome!
Like yourself, I have started tinkering with cars a number of years ago. My "lab rat" was my own daily driver '99 Honda Prelude, and all the repairs I did went well on that car. From my personal experience, the main difference is that you would spend much more time under the car than on top. The only thing that I have fixed that I was able to do from the top was the intake. Given your experience and tools, I'm sure you should be able to tackle most of the work on the Boxster. I hope you will find working on your (future) Boxster as fun (and frustrating, sometimes) as I do.
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