Here’s my list.

• work smarter, this doesn’t necessarily mean working harder or longer hours. Work out when people are taking advantage of your good nature
• don’t choose to work away from home so much, think of all the wasted time
• don’t treat work like a competition in which you need to come first, build lots of friendships and alliances
• take your MBA in your twenties, not thirties
• work out how to spend your time, what’s important and whats not - don’t sweat the small stuff
• dont lose your temper, you’ll feel and look stupid
• don’t buy stupid mid life crisis cars
• start your own business earlier
• realise that it’s not all about the paycheck, it’s about living a fruitful and happy life
• spend as much time as you can with the kids