To schedule automated SMS messages using Twilio and GitHub Actions, start by creating a Python app that sends motivational quotes to a phone number. Create a virtual environment, install dependencies, and build the app. Then, create a GitHub Actions workflow file that uses a cron schedule to run daily at 8:00 UTC. The workflow installs Python, checks out code, sends an SMS, and runs the main.py script. Before pushing changes to GitHub, test locally by running `python main.py`. After pushing, configure environment variables in the repository settings, add secrets for Twilio account SID, auth token, number, and phone number, and your workflow will run daily sending a new quote via SMS.