2. Be wildly ambitious. Always want more.
Despite believing he might not deserve it, Don wants everything for himself. He is captivated by novelty and perpetually chasing some fantasy that is just out of reach.
His hunger for new women can be seen as an extension of his hunger for life in general. When Don proposed to Megan in the second to last episode of season four, it was unexpected, but not altogether surprising. He is an unpredictable dreamer. He admits this himself when we hear him narrating his short-lived journal: "We’re flawed because we want so much more. We’re ruined because we get these things and wish for what we had."
Don is never satisfied with the status-quo. There are greener pastures, better accounts and more exciting women (Sorry Faye!). As a result, he comes across as insatiable, or as Faye bitterly notes, he "only [likes] the beginnings of things."
Imitate Don's lust for life-improvement and you'll find those less motivated taking notes, and also have women clamoring to be the one who captures your fickle attention.