To begin, access the WooCommerce database directly. This is typically hosted on a MySQL server if you�re using a standard WordPress setup. Use a database management tool like phpMyAdmin or MySQL Workbench to connect to your MySQL server. Ensure you have the necessary permissions to read data from the WooCommerce tables.

Identify the specific tables and data you need to transfer. Common tables include `wp_posts` (for product data), `wp_postmeta` (for custom meta fields), `wp_woocommerce_order_items`, and `wp_woocommerce_order_itemmeta` (for order details). Use SQL queries to extract this data. For example, to retrieve products, you might use:
```sql
SELECT * FROM wp_posts WHERE post_type = 'product';
```

MongoDB stores data in BSON format, which is essentially binary JSON. Therefore, you need to convert your extracted SQL data into JSON. Write a script (using a language like Python, PHP, or Node.js) to transform your SQL query results into JSON objects. This script will parse each row of SQL data and convert it to a JSON representation.

Ensure your MongoDB server is installed and running. You can choose between a local MongoDB server or a cloud-based solution like MongoDB Atlas. Use the MongoDB shell or a GUI tool like MongoDB Compass to create the necessary database and collections where your WooCommerce data will be stored.

In your script, establish a connection to the MongoDB server. You can use a MongoDB client library for your chosen programming language. For instance, in Python, you might use PyMongo:
```python
from pymongo import MongoClient
client = MongoClient('mongodb://localhost:27017/')
db = client['your_database_name']
```

With the connection established, use the script to loop through each JSON object and insert it into the appropriate MongoDB collection. For example, insert product data into a `products` collection, order data into an `orders` collection, etc. Use the insert_one() or insert_many() methods provided by the MongoDB client library to perform the insertion.

After the data insertion is complete, verify the integrity and accuracy of the data in MongoDB. Use queries to check that the number of documents matches the expected count and that key data fields are correctly populated. This can be done using the MongoDB shell or a GUI tool. For instance, to count documents in a collection, you can use:
```javascript
db.products.countDocuments();
```
By following these steps, you can manually move data from WooCommerce to MongoDB without relying on third-party connectors or integrations.