Seriously, adjusting valves on a Porsche is no harder than VW Beetle. It just has 2 more cylinders. I realize that some people make $100/hr on this BBS, but for most of us, saving that money and doing it yourself is essentially paying yourself back in labor more than you make during the work week. I just bought all of the goodies to do my tune up/valve adj/oil change and the grand total came to ~$65 including gaskets, plugs and oil. Much cheaper than a mechanic and less inconvenient in that you don't have to drop the car off the night before to have it cool off.
Use the technical article
here to make the job easy.
If you want to make the job even easier, take a 4x4 piece of wood, cut it into two 18" lengths and cut a sharp incline in them using a radial arm saw to create a set of ramps. Driving your rear wheels up onto them gets the back end of the car up in the air, making screwing around with jacking up the car unnecessary. This is a great time saver and feels much safer than relying on a jack or screwing with jackstands.
If you don't own the tools, buy them; they are cheap and available on this website. Take the plunge. The more you get to know your car, the happier the both of you will be.