Before you start, ensure your Excel file is well-organized. Remove any unnecessary data, and format it consistently. Save the file in a directory where you can easily access it from your script. Ideally, convert the Excel file to a CSV format for easier data manipulation.

Use Python to handle this task, as it has libraries that can read Excel files and interact with RabbitMQ. Install `pandas` for data manipulation and `openpyxl` for reading Excel files if you haven't already:
```bash
pip install pandas openpyxl pika
```
`pika` is the Python client library for RabbitMQ.

Create a Python script to read the Excel file. Use `pandas` to load the data:
```python
import pandas as pd
# Load the Excel file
df = pd.read_excel('path_to_your_file.xlsx', engine='openpyxl')
```

Prepare the data for messaging. Iterate through the DataFrame rows and convert each row to a desired message format. For simplicity, convert each row to a JSON object:
```python
import json
messages = df.to_dict(orient='records')
json_messages = [json.dumps(message) for message in messages]
```

Establish a connection to your RabbitMQ server using `pika`. Configure your connection parameters such as the host and port:
```python
import pika
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
# Declare a queue
channel.queue_declare(queue='your_queue_name')
```

Iterate over the prepared JSON messages and publish each one to the RabbitMQ queue:
```python
for json_message in json_messages:
channel.basic_publish(exchange='',
routing_key='your_queue_name',
body=json_message)
print(f"Sent: {json_message}")
```

Once all messages have been published, close the channel and connection to RabbitMQ to free up resources:
```python
channel.close()
connection.close()
```
By following these steps, you can successfully move data from an Excel file to RabbitMQ without relying on third-party connectors or integrations. Ensure your RabbitMQ server is running and accessible, and adjust the connection parameters as needed.