Forest go to Everton on Sunday.
Nuno said: "They score a lot from set-pieces so it's about working, working, working. It's what we've done today, what we'll do tomorrow again and what we've done before yesterday.
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"It's putting things right, and fortunately we only conceded (from) one corner last game. We've been able to be really strong with our pressing.
"It's finding the balance of not conceding set-pieces and, at the same time, when they happen, being focused and determined to solve it."
On the first-ever 'deduction derby', he added: "It's due to the circumstances that you can call it that but it's a very important game for both clubs due to this.
"We are in similar situations with the deduction of points. Both sides don't know how many points will be lost."