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Daymond John Says These Are the 2 Worst Mistakes Entrepreneurs Make When Pitching Investors Avoid these common pitching blunders or risk walking away with empty pockets.

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Getty Images | Brent N. Clarke

Daymond John has seen a lot of people flail -- and fail -- in the pressure cooker known as Shark Tank. They freeze and forget what they're saying. They beg, cry and crumble, sometimes understandably so.

Sweating under the hot Sony Pictures stage 30 lights while persuading an intimidating row of rich, famous and experienced investors can't be easy.

No matter where you pitch and no matter how intense the pressure, coming off as both knowledgeable and enthusiastic about your business and your value proposition is critical, John says. It's also paramount that you present a clear, succinct step-by-step plan as to exactly how and when investors will reap a return on their investment, and in the most memorable way.

Related: 3 Free Things Shark Tank's Daymond John Says You Must Do to Help Your Startup Survive

We asked the Shark Tank star to sum up the worst type of pitching blunder he's seen entrepreneurs make time and again. "There are so many, I can't name just one," he joked not far from the massive wooden Shark Tank doors during a recent press event. "How many do you have time for?"

(By the way, we were surprised to see those ominous iconic doors swing open via two thin, clear strings from above. They mustn't weigh much -- chalk it up to Hollywood smoke and mirrors.)

Here are the two worst mistakes John says entrepreneurs make when pitching investors, on Shark Tank and off:

1. Incorrectly sizing up their market.

"They might say, "I have this idea and it's tapping into a $50 billion dollar market, most of which is going to be mine.' That means absolutely nothing. That's like me saying I just bought a house in a trillion-dollar market and I'm cashing in. If you have too many options, you don't have enough information. You better have some solid research and documentation to back up your claims."

Related: Daymond John's Top 7 Tips on How to Launch Your Product Like a Shark

2. Overvaluing their company.

"Valuing yourself and your company at more than it's worth is a big problem. You're only as valuable to an investor as the money you bring to their portfolio. Going in and saying you need $2 million dollars for something you sold $50,000 dollars worth of doesn't make any sense. Properly valuing your company isn't about guesswork and talk. It's about having hard numbers and being able to explain them quickly and properly."

For more of John's advice for startup success, check out Shark Tank's Season Eight premiere on your local ABC station. It airs on Sept. 23 at 9 p.m. ET.

Kim Lachance Shandrow

Former West Coast Editor

Kim Lachance Shandrow is the former West Coast editor at Entrepreneur.com. Previously, she was a commerce columnist at Los Angeles CityBeat, a news producer at MSNBC and KNBC in Los Angeles and a frequent contributor to the Los Angeles Times. She has also written for Government Technology magazine, LA Yoga magazine, the Lowell Sun newspaper, HealthCentral.com, PsychCentral.com and the former U.S. Surgeon General, Dr. C. Everett Coop. Follow her on Twitter at @Lashandrow. You can also follow her on Facebook here

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