Originally Posted by
factotum
Try going to Minmus first. It will take more fuel to get there (especially since you have to align your orbital plane, which you don't have to do when going to the Mun), but you'll use so much less fuel landing and taking off in Minmus' light gravity* that it more than compensates for that; plus, there are those handy-dandy blue "seas" which are flat and at 0m altitude, so they're absolutely perfect for practicing your landings. Once you've got that down pat, then you should have a much better chance at doing the Mun.