Ok...I have no clue what I'm doing wrong, all I'm able to do is get the...to stages up to 4k dv but anytime I try to get it over, no matter what the fuel/rocket types, it then starts to decline. I'm able to get to the moon and land but not get back from it as I use the return fuel to land, used infinite fuel to test it out and the lander is able to return to kerbin even after using fuel to land. So the main problem I'm having is wasting fuel to get to orbit and to Mun. SO I have 2 theories either I'm making the transit stages to big/ not big enough or my lander is to big.