think of it like Harry Potter and the door to platform 9 3/4.
the only way to get through? believe that you will. close your eyes and run headfirst into it. maybe you'll crash and scrape your nose up on the brick, fall on your ass and watch your precious life tumble off the cart, exposed for all to see. but maybe -if you believe it- you'll make it through.
and what's on the other side will take your breath away.