it's not my DIY but yes it's very thorough. If you have a Boxster, you can do the shortcut method above
The only time it get's a little snug is if you have 19" wheels (it's tight w/ 18's too but not unmanageable). For reference, at the BRBS (Blue Ridge Boxster Summit) in 2007, owners with the assistance of myself and a few others were able to remove the bumper skins, clean the radiators and reinstall the bumper skins on 15 or so cars in well under 2 hours - all were first time bumper skin pullers too. Oh, did I mention we did it while all the cars were lined up perpendicular to the slope
(as you can see we used bricks or pieces of wood lying around to get a few more inches of clearance)