Should I use scripts when calling leads?

Yes, the way a pilot uses a checklist, not the way an actor recites lines. A script's job is to make sure you know what to say next so your brain can focus on listening. Read it enough times that the ideas live in your head, then say them in your own words. People can hear a script being read from a mile away, and it kills trust instantly. Guide, not gospel. When the conversation goes somewhere unexpected, follow the human, not the paper.