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IF you are the possessor of a very vivid imagination, you will probably be already well on the way towards practice with no more than the clue in that sentence: Act as if it were impossible to fail. If you are not, or if you have been badly hurt by failure, there may be some difficulty in beginning to act effectively, but there need not be very much.
To get at it more slowly, the idea is just this: instead of starting wherever you are - or, to be accurate, instead of trying to start, or swearing that you will start, or deceiving yourself into thinking that you are going to start tomorrow or the day after - beset by all the usual doubts of your own performance and memories of past pain, take time first to "make up" your state of mind, the mental condition in which you are going to work.
If you have an important appointment you do not rush out to it unkempt, unwashed, in any old clothes. You take some trouble to make yourself look as well as you can. Man or woman, you brush and clean your clothes, you look for your good points and emphasize them, you hide or improve your blemishes. Then, when you go to your appointment, you try to act as much as possible as if that heightened condition were your normal state.
Now, you are mentally going to an appointment, an appointment with your successful self. How can you arrange your frame of mind to make that appointment fruitful? You first give yourself a model. Everyone has had a taste of success in some line, perhaps in a very minor matter. Think back to it, however childish it was, even if it was a success of your schooldays. It needn't be, even remotely, success in the adult work you hope to do. What you want to recapture is the state of mind in which you once succeeded. Be careful, now; you do not want to overshoot the mark. Don't jump ahead into the elation which followed the success itself. Just recapture the steady, confident feeling that was yours when you knew the fact that was demanded of you, when you realized that you could do the thing that was necessary, that what you were about to do was well within your powers.