Begin by visiting the ChartMogul API documentation at [ChartMogul API Docs](https://dev.chartmogul.com/). Familiarize yourself with the available endpoints and data structures, as you'll be using these to extract data directly.

Log into your ChartMogul account. Navigate to the API section to create your API key and secret. These credentials will be used to authenticate your API requests. Make sure to store them securely for later use.

On your local machine, ensure you have a programming environment set up. You can use Python, Node.js, or another language that supports HTTP requests. Install any necessary libraries; for example, `requests` for Python or `axios` for Node.js.

Create a script to send HTTP GET requests to the desired ChartMogul API endpoints. Use your API credentials for Basic Authentication. For example, in Python with the `requests` library, structure your request as follows:

```python
import requests
from requests.auth import HTTPBasicAuth

url = "https://api.chartmogul.com/v1/customers"
response = requests.get(url, auth=HTTPBasicAuth('YOUR_API_KEY', 'YOUR_API_SECRET'))

if response.status_code == 200:
data = response.json()
else:
print("Error fetching data:", response.status_code)
```

Depending on the structure of the data returned by the API, parse the JSON response to extract the relevant fields you want to save into your CSV file. This might involve iterating through lists or accessing nested dictionaries.

Utilize a CSV library to write the parsed data into a CSV file. In Python, you can use the `csv` module:

```python
import csv

with open('chartmogul_data.csv', mode='w', newline='') as file:
writer = csv.writer(file)
# Write header
writer.writerow(['Field1', 'Field2', 'Field3'])
# Write data rows
for item in data['entries']:
writer.writerow([item['field1'], item['field2'], item['field3']])
```

After exporting the data to CSV, open the file to ensure all data is correctly formatted and complete. Store the CSV file in a secure location, especially if it contains sensitive information. Regularly update your script to accommodate any changes in ChartMogul’s API or your data requirements.

By following these steps, you can effectively extract data from ChartMogul and save it to a local CSV file without relying on third-party connectors or integrations.