Visualization is super important for everything not just picking up women. But make sure when you're going out or about to open on a group of girls that you visualize it going PERFECTLY, imagine exactly how the convo will go and how you're gonna be the time of their lives. Visualize yourself getting in bed with the girl you want. Always make sure what you visualize is positive and it will turn out like that. This may seem unimportant or trivial but it truly is one of the most important things for pickin up girls and every facet of your life. If you visualize negative results, chances are you have lost before you have even begun.
Visualize... ULTRAFRESHNESS!, big pimpin, and winning.