I followed this tutorial and never had any problems: http://docs.google.com/View?id=dnfmv5h_0hbhwdzfv
In this tutorial they also explain how to make your own usb interface to do the jtag. Or you can always buy an lpt to usb interface card. It has to be a whole card, an lpt to usb cable alone isn't enough.
If you can solder a little bit, you'll be fine. I placed the wire on the hole and applied a little pressure on it. Then I heated up the wire untill at a point it gets hot enough to melt the solder which is allready in the motherboard. At that point the wire just 'sinks' into the hole. So it's not basic soldering, I think it's even easier this way.