Id love to say go ahead and do it, because it almost seems like a necessity to have an unsuccesful run to learn your lesson.
But you are going to have a really poor time doing it, and are probably going to ruin a motherboard.
My first dice run was with a custom pot and i had tons of problems.
http://img197.imageshack.us/img197/4691/1000922c.jpg
I would invest in a cheap duniek pot so that you can learn the ropes without ruining hardware.