A casting call for your area, using one of the magazines “Variety?” or is it “Vanity?” I honestly cannot remember, or putting notices whereever you can to get a LOT of response is one way to pursue your dilemma. The more screenings you hold the closer you will be to that “YES” moment when somebody in the crowd pops out at you.
I watched some of the special stuff on the Supernatural season DVD sets where they interviewed one of the two main characters, but when the second one came along HE was the guy who Popped for the other role that had essentially already been filled. That was when the character who plays Dean became Dean and it all seemed so obvious to them after the switch.
Same with other situations, even historically when they were looking for Scarlet O’Hara for Gone with the Wind. Get enough screenings and you will find the ONE THAT FITS! Otherwise, you have to make do with the closest possibility from a smaller pond of fish.
If he/she shows up, trust your instincts, you’ll know when the right one shows up.
