Porsche Boxster 986/987 (1997-2004) Technical Articles | Pelican Parts
PedrosBoard :: DIY Projects
DIY Project Guides - 986 Forum - for Porsche Boxster Owners and Others
There is a lot of information at these links on DIY projects - including the oil change.
Although performing some jobs can be awkward due to the mid-engine configuration, the availability of well-illustrated, step-by-step instructions makes DIY maintenance fairly easy.
Good luck with your new-to-you car.