1. Managing exits. Finding entries follows a mechanical checklist, but exits require balancing greed and fear while trying to maximize profit without giving too much back to the market. 2. When price invalidates the setup logic. A trade loses validity the moment price breaches a key structural level (like a support/resistance break) or time elapses without the expected momentum materializing. 3. Entering with a full position size. It ensures maximum profitability when the move happens immediately and keeps risk calculations simple, clean, and consistent from the start. 4. The urge to micro-manage. Watching lower-timeframe fluctuations can tempt me to cut a winning trade too early or move a stop-loss to break-even before the trade has room to breathe.