Four self-made millionaires echo the same advice for success: Just get started

It may not be easy to build a successful business from scratch — but it's proven to be possible.

Throughout my time working at CNBC, I've chatted with different entrepreneurs, from people who started successful side hustles to the founders of global unicorn companies. Ultimately, I've found that it all comes down to beliefs — what one chooses to believe.

These people chose to believe in themselves. They knew it wouldn't be easy, but they also knew it was possible. With that faith, they went on to risk and sacrifice almost everything for a dream.

The world may see them as inspirational figures, but oftentimes, they are just ordinary people who have faced some setbacks and hard-earned lessons in life.

In my conversations with successful entrepreneurs, I've found that those who became successful and "made it" tend to echo the same advice.

Here's what they credit for their success:

Jason McGowan was no professional baker before he co-founded Crumbl Cookies in 2017, but he didn't let that hold him back from building a cookie empire.

Today, Crumbl is a unicorn company with about 1,000 locations worldwide. The company brought in over $1 billion in sales in 2022, according to documents seen by CNBC Make It.

"I never imagined in my wildest dreams that we would do over $1 billion in sales," McGowan told CNBC Make It. "As I get older and as I build this company, I realize more and more — everything that we do is really just something that anyone can do."

While they'd never stepped into a professional baking kitchen before, McGowan and his co-founder often got together to experiment with chocolate-chip cookie recipes whenever they had free time. Today, their cookies rake in millions globally, and it all came from a decision to believe in an