Yup, solid advice re: waiting. Generally, I've heard it as "don't do anything drastic with the money for a year". That gives enough time to let the emotions cool down.
Some of the worst horror stories are from people that exercised their options and then waited a year to sell the stock to qualify for long term capital gains. Then the stock subsequently crashed so they owed a massive AMT tax for the difference between strike price and price on exercise and got almost nothing from the actual stock sale.