I have cut myself a few times.. one of them deep enough to warrant a few days off to heal. It didn't really drop my confidence as looking back I found that it was a lack of concentration on my part since I was talking with my wife and the dog got under my feet ( I normally close the bathroom up when I shave but she REALLY wanted to talk ). As others have said as well.. too much concentration can be just as bad as too little.

Everyone deals with set backs differently though. I am more of a life happens kind of person so not much ever really bothers me or my confidence level. I also am not a perfectionist unless it comes to my job and since shaving is more a relaxing/enjoyment for me it is the process not the outcome that concerns me most.