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Hey, all. I never tried a slingshot maneuver and was looking for some tips on how to even begin thinking about it. While the definition seems simple enough -- using another planetary body's gravity to propel me further towards my target, saving fuel/Delta-V -- I'm totally clueless on how to put it into action. Using only stock tools (as I'm playing on the Xbox), what's the best way to plan for a slingshot with the Mun to reach Duna for example? How do I even figure out how much Delta-V I'll require beforehand? I was thinking the best way to plan it would be by trial and error in the Orbit screen, plotting burns until it gets to where I want. But if this is the best way to do it, it means I must have my craft already in orbit to begin with, right? Is there no way for me to plot this from the ground before launching my craft? And - only 1 more question, I promise xD - how do I know when is the best time to launch my craft - is it when my target planet is closest to Kerbin, or when the planet is a bit retrograde so it will be closest to Kerbin by the time my spaceship gets there; or am I'm overthinking way too much and the Delta-V difference is just negligible in both cases? Thanks!