I think part of the fear for me is that if the solution in my head doesn't work I won't be able to come up with another one, but in reality even if the initial

I think part of the fear for me is that if the solution in my head doesn't work I won't be able to come up with another one, but in reality even if the initial solution is not correct it usually leads to ideas of how to change it or how to re-think the problem from a different angle.