A plan B isn’t doubt. It’s what lets you go all in on plan A without panicking.

Having a fallback is often treated as hedging, as if preparing for failure invites it. The opposite tends to be true. Most of what makes people cautious is the fear of what happens if the main plan collapses, and once that question has an answer the fear stops taking up room and you can commit properly.

Spend twenty minutes writing down what you would actually do if this did not work out. Not in detail, just enough to see that it is survivable. Then put it away and go at plan A harder than you would have dared without it.