I read as much as I could on the subject and bought the SIR B90 tool so I could do it in my small garage. I am fairly mechanically inclined so I thought it was a job I could handle. Using the Bentley manual and the instructions on the Dorkiphus site
How To: Boxster Rear Wheel Bearings - Dorkiphus.net (you need to register to see the pictures) I got started at 9:00 a.m. Saturday morning. I finished (including changing out the rear brake pads) at 3:00 p.m. Total time spent pulling out the old bearing and pressing in the new one = 15 minutes. Total time spent in disassembling and reassembling everything to get the rear axle out = 5 hours and 45 minutes. And that is with no stuck bolts or parts that wouldn't come out. It just takes that long.
But, in the end, I no longer have that rear wheel bearing moaning and groaning.