The engine mount is an easy do it yourself job. Plenty of how to guides on this site, or on Pelican Parts.
http://www.pelicanparts.com/techarticles/Boxster_Tech/10-ENGINE-Engine_Mounts/10-ENGINE-Engine_Mounts.htm
As for the suspension. There are several DIY's on here also or Pelican Parts.
If you are not confident with the suspension, I would take it to a proper wheel alignment/ suspension place. It will be cheaper and the Porsche place would probably outsource that work anyway.
As with most things car related the initial cost is the painful part. If you can maintain the vehicle yourself, you will save big $$$ every year.
Buy yourself a Durametric from USA & you can check and clear codes.
Our local Porsche center charges $170 an hour for mechanical work. They get none of mine.
Good luck with the car, you will love it.
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