To automate the process of sending customized messages to leads, a workflow called a "Zap" can be set up using Zapier, which sends information from one app to another without manual data entry. This tutorial shows how to create a multi-step Zap that adds or updates a HubSpot contact when a contact gets updated in Google Contacts, ensuring lead information is accurate and up-to-date in real time, allowing for personalized outreach at scale. The process involves connecting the Google Contacts and HubSpot accounts, creating triggers and actions steps, filtering existing data, and updating contact records with customized fields and values. With this Zap, duplicate entries can be avoided, and lead data can be enriched to improve outreach efforts.