@realjohnboy,
John, "Irrational exuberance" suggests that the stock market is over-valued, but how does one measure that? Not even price/earnings ratios are dependable forecasters of how the stock market will react.
If one bothers to watch and listen to the financial pundits, they all react to one day's movement as if it has some meaning to them; it doesn't. A few days hence, and it's all forgotten. None of them are able to tell us how the economy will react in the short-term or long-term; they provide guesses. That should be the clue that no one is capable of predicting future stock market movements.
I use 'gut feeling' based on many readings of the financial news and a little understanding of micro and macro economics. It's been pretty accurate; I've sold 37% of my investments when the market hit 14,000 and repurchased them when it was down to 8,500. That was the period from 2006 to 2009 when the average loss for investors was 40%, and I lost 17%. Last year, my funds increased by 22%, and felt this year will be a struggle year - and so far, I've been correct. I sold some of my gains last year to provide some cushion on my cash position. The DOW is up 2.32% YTD, and my funds are up 5.82%. I don't follow the advise of professional investment counselors who recently said we should be holding 50% bonds and 50% equity. I think that is very foolish, and I believe my performance over the average for last year and this year proves my point.
The important principles of investing are 1) buy low and sell high, 2) purchase stock at regular intervals to average cost your purchse, 3) sell your stocks at regular intervals to average price for your sales, 4) don't react to the daily ups and downs of the market, 5) if you believe the trend is moving in one direction, it's okay to rebalance your portfolio, and 6) it's okay to 'gamble' with about 10% of your holdings on individual stocks, but know when to buy and sell. Set a price to sell when it losses say 10% of your purchase price. Say you purchase a stock for $100, and it losses $10. If you sell, and purchase another stock, all you need to recover is $11 to make up the $10 loss. As the loss gets bigger, it become more difficult to make up the loss.
Stay on top of your investments, and rebalance them as necessary to make sure none will become a drag on your total investments.