If you really wanted to sell your coins on bull market then go for it, If market is bloody don't ever panic, I made a bad decision before so i wanted you to be patient at all times.
You'll encounter alot of bear market but still you should learn from your mistake.
Panic is very difficult to handle and its happen everytime the price getting lower again and again. We are panic because our asset get loss and hopely not all people panic to sell their asset. Decision also will be very bad if we make decision during panic. Try to be calm before making decision.