I think the opposite of fear is freedom. I don't think fear is good in any situation, no matter what. Fear doesn't make you feel good, your insides turn over, and you focus on worst case situations. You don't want fear no matter what, because fear does NOT let you think clearly.
I say the opposite is freedom because that is what you have when you don't let fear stop you. You are free to accomplish your goals (Not just REI, but everything), and to live your life the way you dreamed of. I had a huge fear of rejection, hearing the word 'no'. It feels good once you aren't being held hostage by a stupid fear your mind created.
These are two things I do each day:
(Atman means your soul)
1.) Start the anti-current from today. Deny the body, and identify yourself with the all pervading, immortal, fearless Atman. Entire denial of the body cannot come in a day or a week. Constantly think of the Atman. Gradually you will become fearless. You will have to fight against the Samskaras of Anadikala (beginningless time). The more you think of Atman, the more courageous you will become. By constant hammering only can you entirely drive the nail into the wall or a plank. Even so, by constant and protracted thinking on Atman alone you can become absolutely fearless.
2.) Sit with closed eyes in the early morning. Meditate on courage, the opposite of fear, for half an hour. Think of the advantages of courage and the disadvantages of fear. Practice the virtue during the day. Feel that you actually possess courage to an enormous degree. Manifest it in your daily life. In some weeks or months fear will be replaced by courage. Repeat the formula “Om courage” mentally, daily several times.
I hope this helps someone out there.