First, ensure that you have access to both Microsoft Dataverse and PostgreSQL environments. You will need the necessary permissions to read data from Dataverse and write data to PostgreSQL. Install any required software such as SQL Server Management Studio (SSMS) for querying Dataverse and a PostgreSQL client like pgAdmin for interacting with your PostgreSQL database.

Use the built-in data export capabilities of Microsoft Dataverse. Navigate to the Dataverse environment, and use Advanced Find or specific queries to select the data you need. Export this data to a CSV or Excel file. Ensure that you include all necessary fields and maintain the data integrity during export.

Once you have the data exported, you may need to transform it to fit the schema of your PostgreSQL database. This involves cleaning and formatting the data as needed, which may include adjusting date formats, removing unwanted characters, or ensuring that numeric values are correctly formatted. Use tools like Excel or scripting languages such as Python or PowerShell for this process.

Before importing data, you need to ensure that your PostgreSQL database has the necessary tables to receive the data. Based on the data structure from Dataverse, write SQL scripts to create tables in PostgreSQL. Define appropriate data types and constraints to match your data's schema requirements.

Use PostgreSQL's built-in data import functionality to load the data. You can use SQL commands such as `COPY` or `\copy` for bulk loading CSV files into the PostgreSQL tables. For example:
```sql
\copy tablename(column1, column2, ...) FROM '/path/to/your/file.csv' DELIMITER ',' CSV HEADER;
```
This command allows bulk data import while handling CSV format efficiently.

After the data has been loaded, verify that it has been transferred accurately. Run SQL queries to check for data consistency and correctness between the source data in Dataverse and the destination tables in PostgreSQL. Look for discrepancies such as missing rows, incorrect values, or formatting issues.

For ongoing data migration needs, consider automating the process using scripts. You can write a script in PowerShell, Python, or a similar language to automate the export, transformation, and loading processes. Set up a scheduled task or cron job to execute the script at regular intervals, ensuring your PostgreSQL database remains up-to-date with changes in Dataverse.

This guide provides a structured approach to manually moving data from Microsoft Dataverse to a PostgreSQL database without relying on third-party tools.