If we can't score a goal at home, then we deserve to go out.
If we DO score, then they'll need four to win it. In any game that's sufficiently open for them to score four, then I'd expect us to score MORE than one.
If we make them commit players forward, then there will be opportunities for us at the other end and we'll be fine. The thing we absolutely must not do is gift them goals.
Fortunately, that's something we never, ever do.