When we are striving to accomplish some personal goal, say holiness or weight loss, it is also a good idea to look for our own weaknesses.
So, if someone is trying to lose weight, he ought first to investigate: what, in general, are the biggest contributors to weight gain? And of them, what is he most likely to indulge in? Then he cuts it/them out, one at a time.
If one is aiming for holiness, he has to look carefully at himself, and find his weakest points: manifestations of pride, self-love, impatience, etc. Then he has to work at rooting them out, one at a time, or one group of related weak points at a time.
Just like preparing for a battle.