By all means take on challenges, they are the only way to grow. However, remember women are prone to sometimes taking on too much. The key is to challenge yourself on the side of what is reasonable – the "manageable risks". You will fail occasionally – we all do. But that is where the greatest learning comes from. As a famous golfer once remarked, "The more I practise, the luckier I get". If you find yourself taking on more than you can handle or having too many failures in a row, it is time to scale back on the challenges and reflect which ones are the important ones to you. Women often say they are "stretching themselves too thin" but the truth is often that they are merely too hard on themselves, too impatient, too much of a perfectionist…or very likely some mix of all three. Women who are successful in male-dominated fields are particularly ambitious and while this trait leads to their greatest achievements, it can also be their cross to bear when taken to the extreme. They key is in "biting off" the challenges that are the highest profile, mean the most to you and then delegating the rest so that you don't choke on own success.