PORTLAND, Ore.--(BUSINESS WIRE)--Robert B. Pamplin Jr., America’s foremost diversified entrepreneur, shares nine essential guidelines for becoming a successful entrepreneur. In a saturated and increasingly competitive market, Pamplin notes that the first steps toward a prosperous entrepreneurial career begin with a strong imagination, belief in yourself and your abilities, and refusal to quit in the face of adversity. “To achieve entrepreneurial success, it is crucial that you believe in yourse