Removing blame and judgement of myself was key. Understanding that each day was one small step and not a requim on my character, you know. Discipline and focus aren't things ANYBODY just has, they aren't even really personality traits. You wake up each day and make a value judgement about how you spend your time. Flossing, reading a book, working out, whatever.

Another way I've heard this expressed is that each day you succeed or fail "small". Don't overweight small mistakes.

Lastly, change one thing at a time. It's really hard to form new habits, so make one change and after a few months, if you are holding it steady, make another. Eventually this adds up.