I'm currently using the dremel with shaft attachment that Wookiepelt linked. I find that if I hand drill the pilot hole and then switch to the dremel with the flexible shaft for the larger bit, works wonders. I've got a dremel that I can adjust the RPM's on and have found that a lower RPM works the best. The higher RPM's wants to eat through the model (put a bit straight through an arm and into my finger, hurts like a bitch and then you have to pull the still spinning drill bit out!).