Satchel Paige once said, "You have to believe in yourself. When you believe, you do."
I’ve seen this often enough—a pitcher who has the stuff, the command, everything it takes—but he doesn’t believe in himself and his abilities, and that’s where the trouble lies. He has all this self-doubt bubbling around in his head, all those "what if"s, the "suppose I get out there on the mound and fizzle"s, the “what if my stuff doesn’t work”, et cetera, et cetera, et cetera—and all this, more than the lack of ability, is what’s going to screw the pooch as far as his pitching is concerned. Conversely, a pitcher who doesn’t have much stuff—maybe a couple of pitches—but who has supreme confidence in himself and his ability to get the hitters out—can and will be highly successful. Look at Mariano Rivera: he has two pitches, that devastating cut fastball and a very good two-seamer which he uses sometines, and he’s practically a strikeout machine, because he can do it and he knows he can do it.
I remember way back, to the time I decided I wanted to know something about the slider. When I asked Ed Lopat—I told him I just wanted to ask him something about the slider—his response was to draw me aside and show me how to throw a good one. It was much more than that; the moment I asked him that question he knew instantly where I was coming from, that I was really interested, really wanted to know and was willing to work at it, and he took me in hand, worked with me and helped me all he could. He knew that I was not particularly fast; he also knew that I was a natural sidearmer and that I had the control and the command, and he showed me how to take full advantage of what I had and could do. And he instilled in me an unshakeable confidence, that sense of being in command on the bump, and it stayed with me for more than twenty years. A really good pitching coach—and he was one of the finest—will do that.
In a sense, I was one of his projects. Many were the times I felt that we were just a couple of pitchers comparing notes; that was what he wanted me to think, and I did, and what I learned from that incredible lefthander was nothing short of priceless. So, by all means, go to it. 8)