All of my investment mistakes over the past 30 years have been on the sell side. Sometimes I sell too soon, sometimes I sell too late. My buys have all been great. Of course, I've been working in a 30 year bull market so any buy over the past 30 years has been good. It is the selling that is tricky. For the most part I sold stuff too soon. Had I just held the first stuff I bought 30 years ago until now I'd be loaded.