To be honest, I feel like I should be looking at it like "We Kerbals have never flown to Jool before!" .... so therefore, to 'succeed' properly, I have to calculate all the .... myself, at least once.....! I mean, how the hell do they know how much DV it takes? If they knew, they wouldn't need me! But that's an awful lot of math when I'm just trying to geek out.