Start by exporting the data from VictorOps. VictorOps allows you to export data, such as incidents and alerts, in CSV or JSON format. Navigate to the reporting or export section in your VictorOps dashboard and select the data range or specific data you need, then download it to your local machine.

Once you have the data exported, you need to ensure it's properly formatted for Firestore. If your data is in CSV, consider converting it to JSON since Firestore works more seamlessly with JSON. Use a script or online tool to transform the CSV data to JSON, ensuring that your JSON structure aligns with the Firestore document structure you plan to use.

If you haven’t already, create a Google Cloud project where your Firestore will reside. Go to the Google Cloud Console, click on "Select a project," then "New Project," and follow the prompts to set up your project. Ensure that Firestore is enabled for your project by navigating to the Firestore section and selecting "Create Database."

Install the Google Cloud SDK on your local machine. The SDK provides the `gcloud` command-line tool and the `firebase` CLI, which you'll use to interact with Firestore. Follow the installation instructions specific to your operating system from the official Google Cloud documentation.

Use the Google Cloud SDK to authenticate with your Google Cloud project. Run the command `gcloud auth login` and follow the prompts to log in with your Google account. Then set your project using `gcloud config set project [PROJECT_ID]`, replacing `[PROJECT_ID]` with your actual project ID.

Develop a script in a programming language of your choice (e.g., Python, Node.js) that will read your JSON file and upload the data to Firestore. Use the official Firestore client library for your chosen language. The script should iterate over each record in your JSON file, create a Firestore document, and set the document data accordingly.

Example in Python:
```python
import firebase_admin
from firebase_admin import credentials, firestore
import json

# Initialize the Firestore client
cred = credentials.ApplicationDefault()
firebase_admin.initialize_app(cred)
db = firestore.client()

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

# Upload data to Firestore
for record in data:
doc_ref = db.collection('your_collection_name').document(record['id'])
doc_ref.set(record)
```

After running your script, verify that the data has been successfully uploaded to Firestore. Navigate to the Firestore section in the Google Cloud Console and check the collection to ensure all the documents are present and the data is accurately represented as expected. Make adjustments to your script or data if you encounter any errors or discrepancies.

By following these steps, you can effectively move data from VictorOps to Google Firestore without relying on third-party connectors or integrations.