Ensure you have a text editor and a programming environment installed on your computer where you can write and execute code. Python is a good choice for this task due to its built-in JSON support. Make sure Python is installed on your system.

Use a script to open and read your source JSON file. In Python, you can do this with the `open()` function and the `json` module. ```python
import json
with open('source.json', 'r') as source_file:
data = json.load(source_file)
```
This code will load the content of `source.json` into a Python dictionary or list, depending on the structure of your JSON.

Validate the data to ensure it meets your needs before transferring it. You might want to check for specific keys or values, or transform the data slightly. For example:
```python
# Example transformation: filter out entries without a required field
transformed_data = [entry for entry in data if 'required_field' in entry]
```

Before writing to the destination file, decide if you want to overwrite any existing data or append to it. If you want to start fresh, ensure the destination file is either empty or non-existent.

Use the `open()` function in write mode to create or overwrite the destination JSON file, and use the `json.dump()` method to write the data.
```python
with open('destination.json', 'w') as destination_file:
json.dump(transformed_data, destination_file, indent=4)
```
The `indent` parameter formats the output to be more readable.

Read the `destination.json` file and print its contents to ensure the data was transferred correctly.
```python
with open('destination.json', 'r') as destination_file:
verified_data = json.load(destination_file)
print(verified_data)
```
Check that the printed data matches your expectations.

Enhance your script by adding error handling to manage potential issues such as file not found errors or JSON decoding errors.
```python
try:
with open('source.json', 'r') as source_file:
data = json.load(source_file)
with open('destination.json', 'w') as destination_file:
json.dump(data, destination_file, indent=4)
except FileNotFoundError as e:
print(f"Error: {e}")
except json.JSONDecodeError as e:
print(f"Error decoding JSON: {e}")
```
This will make your script more robust and reliable.