Before starting, ensure you have access to the SFTP server and RabbitMQ instance. Install Python on your machine, as you will use it for scripting. Additionally, install the `pysftp` library for SFTP operations and `pika` for RabbitMQ interactions. You can install them using pip:
```
pip install pysftp pika
```

Write a Python script to establish a connection with the SFTP server. Use the `pysftp` library to connect and authenticate using your credentials.
```python
import pysftp
sftp_details = {
'host': 'your_sftp_host',
'username': 'your_username',
'password': 'your_password'
}
with pysftp.Connection(sftp_details) as sftp:
print("Connected to SFTP server")
```

Once connected, list the files you wish to transfer and download them to a local directory. Choose the directory according to your storage capacity and organizational needs.
```python
remote_path = '/path/to/sftp/files'
local_path = '/local/download/directory/'
with pysftp.Connection(sftp_details) as sftp:
sftp.get_d(remote_path, local_path, preserve_mtime=True)
print("Files downloaded from SFTP server")
```

If the data needs to be processed or transformed before sending to RabbitMQ, add the appropriate logic here. This could include parsing, filtering, or converting file formats.

Use the `pika` library to connect to your RabbitMQ instance. You will need the connection URL or the host, port, and credentials.
```python
import pika
rabbitmq_credentials = pika.PlainCredentials('your_username', 'your_password')
connection_params = pika.ConnectionParameters(
host='your_rabbitmq_host',
port=5672,
credentials=rabbitmq_credentials
)
connection = pika.BlockingConnection(connection_params)
channel = connection.channel()
print("Connected to RabbitMQ")
```

Open the previously downloaded files and publish their contents to a RabbitMQ queue. Choose or create a queue where the data will be sent.
```python
queue_name = 'your_queue_name'
channel.queue_declare(queue=queue_name)
for filename in os.listdir(local_path):
with open(os.path.join(local_path, filename), 'rb') as file:
data = file.read()
channel.basic_publish(
exchange='',
routing_key=queue_name,
body=data
)
print(f"Published {filename} to RabbitMQ")
```

After publishing the data, close all connections and clean up any local files if necessary to free up space.
```python
connection.close()
print("RabbitMQ connection closed")
# Optionally delete local files
for filename in os.listdir(local_path):
os.remove(os.path.join(local_path, filename))
print("Local files cleaned up")
```
Following these steps will allow you to move data from an SFTP server to a RabbitMQ instance using Python and its libraries without relying on third-party integrations. Adjust hostnames, credentials, and paths as needed for your specific setup.