Start by navigating to the Trello website (https://trello.com) and log in using your credentials. Ensure you have access to the board from which you want to export data.

Once logged in, locate and open the Trello board containing the data you wish to export. Ensure the board is fully loaded to make all data accessible for export.

Trello provides an option to export board data in JSON format:
- Click on the "Show Menu" button on the right side of the board.
- Click on "More" and then select "Print and Export."
- Choose the "Export as JSON" option. This will download a JSON file containing all the data from the board.

Open the downloaded JSON file using a text editor or a code editor like Visual Studio Code or Sublime Text. Familiarize yourself with the structure of the JSON data, noting the key elements you want to extract.

Use a scripting language like Python to parse the JSON and convert it to CSV. Below is an example script:

```python
import json
import csv

# Load JSON data
with open('path_to_your_json_file.json', 'r') as file:
data = json.load(file)

# Open a CSV file for writing
with open('output.csv', 'w', newline='') as csvfile:
fieldnames = ['List Name', 'Card Name', 'Description'] # Define the fields you're interested in
writer = csv.DictWriter(csvfile, fieldnames=fieldnames)

writer.writeheader()

# Extract data and write to CSV
for list in data['lists']:
list_name = list['name']
for card in data['cards']:
if card['idList'] == list['id']:
writer.writerow({'List Name': list_name, 'Card Name': card['name'], 'Description': card.get('desc', '')})
```

Execute your script in a terminal or command prompt. Ensure Python is installed on your system and that you have the necessary permissions to run scripts and access files.

Once the script executes successfully, locate the `output.csv` file in your specified directory. Open it using any spreadsheet software like Microsoft Excel or Google Sheets to verify that your data has been correctly exported and formatted.

By following these steps, you can effectively move data from Trello to a local CSV file without relying on third-party connectors or integrations.