What does "begin with at the end" mean?

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Like you, I suspect the writer made a mistake. They could use either "with" or "at" but not both.

Beginning at the end generally means solving a problem by focusing on the end result. We sometimes call this "working backwards."

For example, if you have too many clothes and never know what to wear, you might only focus on that and ask "How do I choose what clothing to get rid of?" But beginning at the end might instead mean focusing on your desired result, stating "I want to have a simple wardrobe where every item matches everything else," and then selecting only items that qualify and throwing everything else out.

It seems the writer might wish to say that rather than improving skill in order to increase joy, try just being happy and your skill will probably improve. ...or something like that!

Thanks for a great question that made me think!
!!