Real easy guys. Theres a jack point right in front of the muffler, under the U shaped aluminum brace, where you can jack up the entire rear end. With the back end up on jack stands, theres a jack point at the front of the car, see first image at the link below, that you can use to jack up the whole front end. Just jack up one side and the other side will go up with it, put a jack stand on the jack point thats opposite the jack and then put the last jackstand under the jack point on the jack side.
Once you have all the jackstands in place, go linebacker on the car, push on the front and rear bumpers and try to knock it off the stands to make sure the stands are secure.
Pelican Technical Article: Jacking Up and Lifting the Boxster on Jack Stands - 986 / 987