Begin by thoroughly reviewing the AppFollow documentation to understand how you can export data. AppFollow typically allows users to download data in CSV or Excel formats. Identifying the correct export options will ensure you have the desired dataset for migration.

Using the identified export feature, manually download the data from AppFollow. Ensure that the data is in a structured format, such as CSV, as this will simplify importing into PostgreSQL later. Save these files securely on your local machine or a server that you can access.

Set up your PostgreSQL environment if it is not already in place. This involves installing PostgreSQL on your local machine or server and creating the necessary database and tables that will accommodate the data from AppFollow. Use SQL commands to define the schema that matches the structure of your exported data.

Open the exported CSV files using a spreadsheet application or a scripting tool like Python or R. Inspect the data for any inconsistencies, such as missing values or incorrect data types, and clean the data accordingly. Transform the data if necessary, so it aligns with the PostgreSQL table schema.

Use PostgreSQL’s built-in tools, such as the `COPY` command, to load the clean CSV data into your PostgreSQL tables. This can be done using a command-line interface or a database management tool like pgAdmin. Ensure you have set appropriate permissions and configurations for a successful import.

After loading the data, perform verification checks to ensure that the data in PostgreSQL matches the original data from AppFollow. This can be done by running sample queries and comparing results with the source data. Check for row counts, data types, and spot-check various fields for accuracy.

Since you are not using third-party connectors, consider writing a custom script (using Python, Bash, etc.) to automate the data export, cleaning, and import process for future data transfers. Schedule this script using a task scheduler like cron (on Unix-based systems) or Task Scheduler (on Windows) to ensure regular updates.

By following these steps, you can successfully move data from AppFollow to a PostgreSQL destination without relying on third-party connectors or integrations.