It's likely a super simple deal. If you own a crappy crescent wrench you can do it. Find these screws on the rear inboard portion of the a-arm. Turning them left lowers the car, right raises it. That's assuming you have adjustment room, aka the caps (gray part) aren't bottomed out.
If you count the number of turns, you can go back to exactly where the car was and "undo your change.
When you're happy with the height, you can get get the front toe adjusted by any regular alignment shop. Front toe on a 911 is no different than any other car. Just make sure the shop doesn't mess with your camber/caster. You'll likely gain a little negative front camber with lowering, but that's actually beneficial. The rear alignment is a massive PITA and it's best to leave that to a place familiar with 911s.
Whole project that way should cost you $50 instead of $350.
Also, I dig your color for obvious reasons...
