I agree this is one of the most important things to know in any kind of fighting weather it be MMA,Boxing,or what ever ur style. Too make it simple for new ppl that might not grasp this concept just put it this way: It doesn't matter how much bigger or smaller u are than ur opponant if u got the skill over him. U could be like 5'3" and 110 pounds just say and u could go up against a guy that is 6' and 200 pounds and still go in there and kick tha shit out of him if u got the skill and he don't. One of my favorite things to tell ppl the person may be able to knock my head off in one punch with his size but he has to get that shot in first if that makes any sence. Not being cocky just confident that I can win no matter what.