Begin by manually exporting your data from Notion. Open the Notion page or database you want to export, click on the three dots in the upper-right corner, and select "Export." Choose the export format as CSV or JSON, depending on your preference and the complexity of your data. This will download your data onto your local machine.

Once you have the exported file, review its contents. If your data is in CSV format, use a spreadsheet application or a script to clean and organize the data to ensure it aligns with your intended structure in Redis. For JSON, ensure the structure matches your Redis data model.

To interact with your Redis database, install a Redis client on your local machine. You can choose from various clients based on your programming language preference. For Python, install `redis-py` using pip: `pip install redis`. For Node.js, use `npm install redis`.

Develop a script in your preferred programming language to parse the exported data file. For CSV files, use a CSV parser to read each row and column. For JSON files, use a JSON parser to traverse the object. Ensure your script can extract the necessary fields that you intend to store in Redis.

Use the Redis client to establish a connection to your Redis server. This typically involves specifying the Redis server's hostname, port, and any authentication credentials if necessary. For example, in Python, you can use:
```python
import redis
r = redis.Redis(host='localhost', port=6379, db=0)
```

Decide how to structure your data in Redis. Redis supports various data types like strings, hashes, lists, sets, and sorted sets. Map each piece of data from the parsed file into the appropriate Redis data type. For example, you might store a row from a CSV as a Redis hash with column names as keys.

Iterate over your parsed data and use the Redis client to load each entry into your Redis database. Use the appropriate Redis commands to insert data based on your mapping from the previous step. In Python, you might use:
```python
r.hmset('key', {'field1': 'value1', 'field2': 'value2'})
```
Ensure you handle any potential errors and verify that the data is loaded correctly by retrieving and checking a few entries in your Redis database.
By following these steps, you can successfully transfer data from Notion to Redis without relying on third-party connectors or integrations.