First time I tried this (Yes I was using Mechjeb) I slammed into Tylo at 1800 m/s, mainly because my orbit was too low. Second time I tried it I put unlimited fuel on because I knew it'd take a lot. So I landed safely, then took off again to orbit, and landed again, second time doing it manually. Yep, you're right, IT'S DIFFICULT! I'm off to Vall next.