Rule reminder
Bisogna + infinitive (always singular, no object clitic). Occorre + infinitive (formal, always singular). Serve/Servono + noun or infinitive (agrees with noun; takes indirect object clitics). Ci vuole/Ci vogliono + noun (agrees with noun). All four can be negated with 'non'.
… molta attenzione per svolgere questo compito. (ci volere)