[JayG]

Changing a tire on a Porsche is the same as changing a tire on any other car. If you need professional help for that, so be it.
BTW, a lot of "professionals" don't do it right, they just use an impact wrench and don't check for proper torque

Harbor Freight has a decent 1/2" torque wrench for under $12 on sale. If you search for coupons, you can find them for $12.99, sometimes $9.99. If all yo are going to use the jack for is changing tires, then one of the trolley jacks should be fine. If you plan on doing DIY stuff and need to get under the car, then you want a higher lift jack. Be sure to get a low profile one in any case. I bought their 2 ton steel one for around $60 on sale. Their 3 tone jack stands on sale are $20 also get the jack stand covers, they protect the underside of the car.

If all you are doing is tires, you don't even need jack stands

Get a 19mm impact socket, they are deeper and you may need that on some wheels. I also wrapped mine with gaffers tape (you can use duct tape) so it wont scratch the wheels. You can also find online "soft" sockets for around $30 that wont scratch the wheel or lug bolts.

You need to torque the bolts to 96 ftlbs