Start by exporting the data you need from Close.com. Most CRM systems, including Close.com, allow you to export data as CSV files. Navigate to the relevant section in Close.com, choose the data you want to export (e.g., leads, contacts, etc.), and export it as a CSV file.

Ensure that you have DuckDB installed on your local machine. You can install it via Python using the command `pip install duckdb` or by downloading the standalone DuckDB executable from the DuckDB website. Make sure your environment can execute Python scripts or handle DuckDB commands.

Open your exported CSV file(s) using a spreadsheet application or a text editor. Check for any data inconsistencies, such as missing headers or irregular formats, and clean them as necessary. This step ensures that the data will load correctly into DuckDB.

Open a terminal or command prompt and create a new DuckDB database file. You can do this by running the command `duckdb mydatabase.duckdb`. This command will create a new database file named `mydatabase.duckdb` in your current directory.

Use the DuckDB SQL shell to load your CSV data into the new database. Start the DuckDB SQL prompt by running `duckdb mydatabase.duckdb` and then execute the following SQL command to load your data:
```sql
COPY my_table FROM 'path/to/your/exported_file.csv' (AUTO_DETECT TRUE);
```
Replace `my_table` with your desired table name and `path/to/your/exported_file.csv` with the path to your CSV file.

After loading the data, verify the data import by running a simple query. For instance:
```sql
SELECT * FROM my_table LIMIT 10;
```
This query will show the first 10 rows of your table, allowing you to check if the data has been imported correctly.

With your data now in DuckDB, you can perform any additional data manipulations or analyses as needed. Utilize DuckDB's SQL capabilities to transform and query your data according to your requirements. This step is optional and depends on your specific use case.

By following these steps, you can successfully transfer and manage your data from Close.com in DuckDB without relying on third-party connectors or integrations.