My Porsche was sold to me with the condition that it not be taken to a commercial shop, dealer or otherwise. I was to work on it or have the seller work on it. Except for alignments (which I monitor by watching/helping the tech on the rack - most have to be shown how to find the alignment specs in the computer and how to make the adjustments especially in the rear end) I've been able to abide with that condition and can likely continue to do so into the future. In five years of of Porsche ownership and through the complete restoration of a 1973.5 T except for sending engine parts off to Ted Robinson in Sunnyvale for reburbishing, mounting tires (always take wheels off and take to local shop) and alignments we did it all including corner balancing in our garage with a portable frame and scales. It's a hobby out of control!
Jim