Begin by ensuring you have a Redis server running. You can install Redis locally on your machine or use a remote server. For local installation, you can download it from the official Redis website and follow the installation instructions for your operating system.

Install the `redis` package in your n8n environment to enable communication with the Redis server. This can be done by executing the following command in your terminal: ```
npm install redis
```
This will allow you to use Redis in your custom scripts within n8n.

Open n8n and create a new workflow. This workflow will be responsible for extracting data and preparing it for insertion into Redis.

Add a 'Function' node to your workflow. This node will be used to prepare the data you wish to send to Redis. Within the Function node, write JavaScript code to transform or format your data as needed for Redis.

Add another 'Function' node to your workflow to establish a connection to your Redis server. Use the `redis` package you installed earlier to create a Redis client and connect to your server. Here is a sample snippet:
```javascript
const redis = require('redis');
const client = redis.createClient({
host: 'localhost', // replace with your Redis server address
port: 6379, // replace with your Redis server port
});
client.on('error', (err) => {
console.log('Redis Client Error', err);
});
client.connect();
```

Within the same 'Function' node, after establishing a connection, insert your prepared data into Redis using the appropriate Redis commands. For example, to set a key-value pair:
```javascript
const key = 'yourKey';
const value = 'yourValue'; // This would be your prepared data
client.set(key, value, (err, reply) => {
if (err) {
console.error('Error setting value in Redis:', err);
} else {
console.log('Value set in Redis:', reply);
}
});
```

Ensure that the Redis connection is properly closed after the data operation is complete to prevent any potential memory leaks or connection issues. You can do this at the end of your 'Function' node script:
```javascript
client.quit(() => {
console.log('Redis connection closed');
});
```
By following these steps, you can efficiently move data from n8n to Redis using custom scripts, without relying on third-party connectors or integrations.