Begin by logging into your Drift account. Navigate to the analytics or data export section, where you can extract the data you need. Drift typically allows exporting data like chat transcripts, contact lists, and conversation metrics in CSV format. Select the relevant data sets and export them to your local machine.

Once you have the CSV files from Drift, review them to ensure they contain all necessary data and are formatted correctly. Open the files using a spreadsheet application like Excel or a text editor to inspect for any inconsistencies or issues such as missing headers, incorrect data types, or extra spaces.

If you haven't already, install DuckDB on your local machine. DuckDB can be installed via package managers or downloaded directly from the DuckDB website. Follow the installation instructions specific to your operating system to complete the setup.

Launch DuckDB by opening a terminal or command prompt and entering the DuckDB shell. Create a new database file by executing a command like `CREATE DATABASE drift_data.db;`. This command initializes a new DuckDB database where you will import the Drift data.

Before importing the CSV data, define the table structure that matches the data schema of your Drift exports. Use SQL commands to create tables in DuckDB with appropriate column names and data types. For example:
```sql
CREATE TABLE drift_contacts (
id INTEGER,
name VARCHAR,
email VARCHAR,
created_at TIMESTAMP
);
```

Use DuckDB's `COPY` command to import data from the CSV files into your newly created tables. Ensure the CSV file paths are correct and that the column orders match. An example command is:
```sql
COPY drift_contacts FROM 'path/to/drift_contacts.csv' (DELIMITER ',', HEADER TRUE);
```
This command imports data from the specified CSV file into the corresponding DuckDB table.

After importing the data, run SQL queries in DuckDB to verify that the data has been transferred correctly. Check for any discrepancies such as row counts, data type mismatches, or null values. Use queries like:
```sql
SELECT COUNT(*) FROM drift_contacts;
SELECT * FROM drift_contacts LIMIT 10;
```
These checks ensure that the data import process was successful and the data is ready for analysis within DuckDB.

By following these steps, you can manually transfer data from Drift to DuckDB without relying on third-party connectors or integrations.