Entrepreneurship requires a specific "set" of skills and psychological traits. Some of the most important soft skills are communication/interpersonal, analytical, & problem-solving skills.

The psychological dimension involves the ability to manage risks, recover and learn from setbacks quickly (resilience), persistence and empathy among others.

For me, learning sales via telemarketing helped a lot. It helped me develop thick skin to handle rejection, learn to listen and understand customer need, as well as close. Many people have difficulty closing the sale because they don't feel worthy.

Sales experience through any means is probably the best preparation for entrepreneurship because it helps you develop the ability to communicate and sell, as well as the ability to manage rejection and recover quickly.

I interview some very successful entrepreneurs at Trep Talks (http://treptalks.com)