Ensure you have Python and MongoDB installed on your machine. Python will be used to request data from the SpaceX API and insert it into MongoDB. You can download Python from [the official site](https://www.python.org/downloads/) and MongoDB from [the MongoDB website](https://www.mongodb.com/try/download/community).

You'll need `requests` for handling HTTP requests and `pymongo` for MongoDB interactions. Install these libraries using pip:
```bash
pip install requests pymongo
```

Use Python's `requests` library to fetch data from the SpaceX API. For example, to get the latest launches:
```python
import requests

response = requests.get('https://api.spacexdata.com/v4/launches/latest')
data = response.json()
```

Start your MongoDB server and create a database and collection where the SpaceX data will be stored. Use the MongoDB shell or a GUI like MongoDB Compass:
```mongo
use spacex_db
db.createCollection('launches')
```

Use the `pymongo` library to establish a connection to your MongoDB instance and access your database and collection:
```python
from pymongo import MongoClient

client = MongoClient('mongodb://localhost:27017/')
db = client['spacex_db']
collection = db['launches']
```

Insert the fetched data into your MongoDB collection. Ensure the data is in a format compatible with MongoDB (usually a dictionary):
```python
if isinstance(data, list):
collection.insert_many(data)
else:
collection.insert_one(data)
```

Check the MongoDB collection to verify that the data has been inserted correctly. You can use a simple Python script or the MongoDB shell:
```python
for launch in collection.find():
print(launch)
```

By following these steps, you'll be able to move data from the SpaceX API into a MongoDB database using Python, without relying on third-party connectors or integrations.