Warren Buffet is not a trader. And Berkshire Hathaway is not a trading firm as much as it is an acquisition and restructuring firm. Regardless, I don't see the fascination with Buffet; there's a ton of stocks that have done just as well - and many did a whole lot better - in the same timeframe.
Secondly, everyone determines the level of risk they want to take on and decides their trading strategy based on their risk appetite and acceptance. Higher risk = higher reward. Lower risk = lower reward. That's the bottom line. Different strokes for different folks.
As far as your risk minimizing strategy, it's nothing unique. There's tons of them out there. Everyone has their pet-strategy to minimize risk. (I have one, too) The thing to remember is that when you lower your risk, you also lower your potential return.
Alot of people look at diversification as a way to decrease risk. But too many people get caught up in buying too many random stocks and start loosing track of them. If you are a trader, I would venture to say that it's better to stick to 5-10 stocks max, and specialize in them, which is what most 'traders' do.
I used to swing and day-trade on the side when I went to school and a little after I graduated. There's 3 things you have to get right to make some money; what to buy, when to buy, and when to sell. I traded about 7-10 stocks over the period of ~2-3 years, and made money (repeatedly) on pretty much all the trades. My portfolio included such gems as WCOM, LU, ATT, Kmart, but that's where I made my biggest money.
I haven't traded in 2-3 years. I'm thinking of gettiing back into it. Anyone who is thinking about doing the same should paper trade for a while. A lot of people remember their good pics and forget their bad pics and think they'll make a bundle in the market. That's why you should write it all down, subtrack comissions, mark down sale prices, and see how good you really are before you have real money on the line. I think there's 'fantasy stockmarket' sites out there that will let you do that...