Start by familiarizing yourself with the xkcd API. xkcd provides a simple JSON API accessible at `https://xkcd.com/info.0.json` for the current comic, or `https://xkcd.com/[comic_number]/info.0.json` for specific comics. This API returns metadata about the comic, including title, alt text, image URL, and more.

Ensure you have Python installed on your local machine since it provides simple tools for handling HTTP requests and CSV files. You can download Python from the official website and follow the installation instructions. Verify the installation by running `python --version` in your command line.

Use Python's pip to install the necessary libraries for making HTTP requests and handling JSON data. Open your command line and run:
```
pip install requests
```
This command installs the `requests` library, which simplifies interaction with web APIs.

Write a Python script to fetch data from the xkcd API using the `requests` library. Here is a sample script:
```python
import requests

def fetch_xkcd_data(comic_number=None):
url = f"https://xkcd.com/{comic_number}/info.0.json" if comic_number else "https://xkcd.com/info.0.json"
response = requests.get(url)
response.raise_for_status() # Raise an error for bad responses
return response.json()

# Fetch current comic data
comic_data = fetch_xkcd_data()
print(comic_data)
```

Determine which data fields you want to include in your CSV file. Typically, you might want the comic number, title, alt text, and image URL. Modify your script to extract these fields:
```python
comic_info = {
"num": comic_data.get("num"),
"title": comic_data.get("title"),
"alt": comic_data.get("alt"),
"img": comic_data.get("img")
}
```

Use Python's built-in `csv` module to write the extracted information to a CSV file. Extend your script as follows:
```python
import csv

def write_to_csv(comic_info, filename='xkcd_comics.csv'):
with open(filename, mode='w', newline='', encoding='utf-8') as file:
writer = csv.DictWriter(file, fieldnames=comic_info.keys())
writer.writeheader()
writer.writerow(comic_info)

# Write the comic information to a CSV file
write_to_csv(comic_info)
```

Finally, open the CSV file generated in your preferred spreadsheet application or text editor to verify that the data has been correctly written. Ensure that all desired fields are present and that the data is formatted as expected.

By following these steps, you can successfully move data from the xkcd API to a local CSV file without any third-party connectors or integrations.