The chances of an instrumental delivery with a VBAC are no higher than any other first vaginal birth (to my knowledge from VBAC birth classes information). I was just unlucky she suddenly became distressed for some unknown reason otherwise I could have pushed her out myself just fine. The chances of complications in general are higher with c sections than vaginal births as it's major surgery.
Only you can make the decision that's right for you. All the information in the world can't predict what will happen during your birth. Go with your gut and just give it your best shot, whatever you choose. Good luck!