Yeah, that's how you have to do it, but the main issues are 1) what do you care about, which actually surprisingly mostly boils down to how you calculate probabilities in multiverse situations and 2) how the hell do you find anything? Sure, you somehow jump to a different universe, but I can't think of a physics based reason why you'd be able to 1) get back to your original universe and 2) find any other one you jumped to previously ever again.