I hope you will enjoy a unique view on why preparation is important, If followed it will leave you at peace and with energy for the next challenge. I have looked and cannot see this perspective shared anywhere so I think it is a 1 min read with a worthy ROI.
The better you prepare for something the quicker you can forget about it afterwards. We dwell on the bad experiences, that with which you revisit over and over again. It haunts your next project, it takes away from your family time, it damages your self esteem. The internalised awareness that you did not do everything to prepare and so fell short of your best.
When you truly prepare and do your best it leaves your mind free to concentrate on new things, new ideas, new opportunities.