Lesson Learned: Over-leveraging on a 'sure bet'

Thought I had a strong conviction play on $GOOGL pre-earnings a few years back. The setup looked textbook, and sentiment was overwhelmingly positive. Decided to size up significantly, well beyond my usual risk parameters, effectively over-leveraging on what I convinced myself was a 'sure bet'. Earnings came in slightly below the most optimistic projections, and the stock gapped down hard. Ended up taking a much larger hit than necessary, erasing weeks of solid gains. It was a harsh reminder that no setup, no matter how good it looks, guarantees anything, and proper position sizing is non-negotiable for long-term survival, especially around binary events.