I want to get rich in the stock market, but I hate doing all the research. So I take the lazy way out as recommended by Peter Bogle - founder of Vanguard Mutual Funds: I have determined from reading and experience that my current "risk tolerance" equates to about 70% investment in stocks. I keep the remaining investment in long-term treasury bonds. I do not own any individual stocks or bonds, but purchase the S&P500 index fund and the long term bond index fund (VFINX and VBLTX, respectively). Every six months, I check the balance. If it is still at 70% I do nothing. If stocks are up, then I sell some to get back to 70% (sell high, right?). If stocks are down, then I sell some bonds and buy stocks (buy low, right?). I have followed this approach since 1994 and I have averaged a tidy 8.5% return on my investments. It does not take much time and I do not have to do any research or stress out about market calamities - when it is time to rebalance I just do it.
When I have money to invest, I invest it gradually over many months. When I need money, I take it out gradually over many months. I dollar-cost-average. Not all my investment moves come at the best or worst time. It might be that I lose an opportunity but it is very safe (well, safe for stock market investing anyway).