It's OK if you panic sell - OK for me that is, not you. Be greedy when others are fearful, don't ever trade on emotion, and do your best rid yourself of herd mentality - you only go with the herd until it is time to turn on them. If you're an inexperienced investor and bear to can't look at the charts in a bear market without the urge to panic sell, then just don't look at the charts.
Remember that you invested based on fundamentals and long term prospects, so there's no reason to stress over short-term price fluctuations. If you invested money you couldn't afford to lose (purchasing power on in the near term) thinking it would make you rich overnight (committing the sin of being greedy at the same time as the rest of the herd), then you invested for the wrong reasons - and are better off buying lottery tickets one at a time.

Bears make money, bulls make money, and sheep get slaughtered.