Putting the Boxster up on stands is very easy - the archives have plenty of suggestions, but I tend to follow the Bentley repair manual.
Use the rear jacking point to lift a side of the car high enough to put a jack stand under the front jacking point. Lower and do the other side.
Then use the rear axle support and lift the entire rear end evenly. Once raised, place jack stands under each of the rear jacking points and lower slowly making sure each stand is secure and does not shift. Watch the front ones too.
Using a borrowed pic (from from someone else's post - RMS anyone??) I've marked it w/ a red X where you should lift from - you can see the oil filter housing in bottom right of picture as well as the engine safety cable.
Note: there is a similar looking support bar just in front of the muffler behind the transmission - it's not the correct one. You want to use the forward one - under the location where the motor and transmission meet.
Once raised w/ the wheels removed, it's always good idea to place the wheels under the side of the vehicle as a safety precaution - especially if you will be working under there. Under no circumstances - never work under a car that is supported only by a hydraulic or mechanical jack. Use jack stands for your own good.
Hope this helps.