Doing a critical analysis of my trades last year, my biggest failing was not trusting my initial analysis. It can be stressed enough that emotions have no place in investing. Do your analysis, pick your targets and prices and (this is the most important part) unless something fundamentally changes after you make the purchase, trust your judgement.
CVS, STX, JPM, CAT, UNH, TSLA, XOM, INTC, BRKB
All of those stocks I misplayed horribly last year. A lot of money I left on the table. Trust your first instincts.