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Mate, anyone with a quality torque wrench and access to the Porsche torque specs will be able to change your bearings. Some dude-with-tools would also be happy to just do it in your driveway for $200 on a Saturday afternoon - very easy to do (45-60 min per wheel). Sure you can print off some torque specs kindly offered by a member here and just get on with it at the garage where you normally fill-up. The garage who has the wheel alignment set-up would possibly be best!
$1,000 for changing four little bearings is far more than what a qualified aerospace engineer do from 'one' full day of hard work lollll
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