For me, the hardest habit is goal setting --or "Begin with an end in mind" --I think that's the official line. But I usually just dive right in without a clear goal to work towards.
The easiest one is to accept responsibility for my own learning. I succeed because I do it (or find people to help me do it) and I fail because of me --not anyone else.
A word about the name of my blog. Gwendolyn has to go through and put them in alphabetical order --so I've made it easy for her by choosing Zblog.