Hmm, not sure what happened to my previous reply, it seems to have made an incorrect burn and gone off into deep space... In a nutshell, I was just chiming in about Mechjeb. I'm new here, but I've been playing KSP for some time now. There seems to be an argument over whether to use it or not, both sides of the argument seem to be an all or nothing. There is a 3rd way! When I first started playing, probably 18 months ago now, I used no mods and it took me an age to learn how to get into orbit, much less doing anything else. Through that though I built upon my pre-existing "knowledge" of space flight and I now understand exactly what Mechjeb is doing. However, last month, I downloaded Mechjeb (and several other mods like KAS, the graphics mod and others). It has made my life so much easier! But I don't use it to work out the manoeuvres, I do that myself, I just get Mechjeb to do the actual burn as I find it hard (especially on that first burn to orbit) to get it done in time, to hold my heading and control the burn. It is certainly a useful tool, but not one that should be relied upon as it can make a mess of things - surely, one of the best moments of my gaming on KSP came from a manual landing on the Mun, even if it did topple over and trap Jeb there - a rescue mission is planned, but it may be pushed back owing to a budget crisis..... I justify using it myself as this - it's not me in the spaceship and any modern spacecraft will use computers anyway to do the actual flying, even if the manoeuvre was planned by a crew member, so I don't feel like it is "cheating" in any way, in fact, it is more realistic.