Before starting, familiarize yourself with the Guardian API documentation to understand the endpoints, authentication, and the data structure you will be dealing with. Similarly, review Convex's documentation to understand how data can be inserted and manipulated within their environment.

Prepare your development environment by installing necessary tools such as Node.js (or any other language runtime you are comfortable with), along with any libraries or frameworks that will help you make HTTP requests and interact with Convex. Ensure you have access to a code editor and terminal.

Use the authentication method required by the Guardian API (usually an API key or OAuth) to gain access. Write a script that uses HTTP requests to fetch data from the desired endpoint. Test this script to ensure you can successfully retrieve data.

Once you have fetched the data, parse the JSON response to extract relevant information. Transform the data into a format that Convex requires for insertion. This might include cleaning the data, reshaping it, or converting data types as necessary.

Use Convex's API or SDK to establish a connection to your Convex database. This will typically involve setting up authentication (such as API keys) and selecting the correct database or collection where the data will be stored.

Write a script to insert the transformed data into Convex. This involves using the Convex API calls to create new records. Ensure you handle potential errors and confirm successful insertion by querying the database after the operation.

Once your scripts are working correctly, automate the process using a cron job or a similar scheduling tool. This ensures that data transfer from the Guardian API to Convex happens regularly without manual intervention. Test the automation thoroughly to ensure reliability.

By following these steps, you can effectively move data from the Guardian API to Convex without relying on third-party connectors or integrations.