Bo Pelini had zero head coaching experience, and while we aren't winning titles, you cant' say he has done a bad job.
Tom Osborne is another that had zero head coaching experience.
Darin Erstad as well, though he's completely changing the culture of B1G baseball.
Bill Callahan, on the other hand, did have head coaching experience. So did Lane Kiffin, Gene Chizik, Dan Hawkins and Charlie Weis.
If the experience is sooo important, you're picking your poison, because any proven head coach is going to be gone in another 5 years if he has great success, then we are back where we left off.