I think the first mandatory requirement is at least to count the money. Alas! I've seen "investors" who have had luck then many quickly they were sinking because of a lack on self-discipline.
I think that is not necessary to say anymore because that is too basic to know how much you are holding, even a kid knows how much money he has. Secondly, I agree that self discipline is very important because without it even if you have a good money management plan you cannot still implement it.