After re-watching the video, the link from the Independent may not be the best example. You'll have to understand a bit about Steve Harvey to figure this one out.
He used to be homeless; he slept in his car and showered at gas stations. Cf.
https://en.wikipedia.org/wiki/Steve_HarveyHere's one of his videos, which goes right to the heart of this:
https://www.youtube.com/watch?v=hQ6fZDo9LGEAlso, if you re-watch your video, you'll see it's all about being strong-willed and determined, i.e., not being lazy.
Doing something "uncomfortable" doesn't really mean overcoming your fears in this context. It's about getting up early in the morning and working until late in the evening, about doing everything possible and then some. Later, he says "you got to give your all."
He wants you to be "knee-deep in work":
http://www.learnersdictionary.com/definition/knee-deepHope this helps.
Best