The 38-year-old will defend his British welterweight title against Gavin on Thursday but believes that his own experience gives him the edge over his opponent.
"I've got the experience, know-how and I've been there, seen it and done it," Witter told World Boxing News. "What has Frankie Gavin done so far?
"I've been in the ring with everyone from Naseem Hamed, Johnny Nelson and Ryan Rhodes to Kell Brook and Kid Galahad. I've mixed it with all weights from flyweights to heavyweights, amateur champions to world champions, so a 13-fight novice doesn't worry me.
"There's nothing in Gavin's armoury or make up that bothers me, his punches, skills, nothing. Everything he does I'll have an answer for and I'll take him out by the fourth round."
Witter has lost five times in a career spanning 15 years.