Throw your hat over the wall

To trap oneself into producing a result or achieving something monumental by making the consequences of not doing so painful, as in throwing one's hat over a wall that appears too high to climb so that one must find a way to the other side else live hatless.

"If you really want to move to that town, quit waiting for perfect circumstances; throw your hat over the wall and put in your 30-days' notice on your apartment so you'll HAVE to find a place down there."

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