The funny thing about the Konami code is it was completely unnecessary and probably did more harm than good.
has the erroneous reputation of being really difficult. I think the big reason for that is the 30 rests became such a crutch for most people that they never bothered to learn the game.
It's one of those games that simply take memorization through rote to master. Once that's achieved, clearing the game without dying (or at least on a single continue) is actually quite simple. I've done it many times myself.