To start, sign up on the TMDb website and navigate to the API section to generate an API key. This key will allow you to make requests to TMDb's API to retrieve the necessary data.

Determine which data you need from TMDb. This could include movie titles, release dates, genres, etc. Review the TMDb API documentation to understand the structure and types of data available.

Write a Python script using the `requests` library to fetch data from TMDb. Make GET requests to the appropriate TMDb API endpoints using your API key. Parse the JSON response to extract the required data. Here’s a basic example to get you started:
```python
import requests

api_key = 'your_tmdb_api_key'
url = f'https://api.themoviedb.org/3/movie/popular?api_key={api_key}'

response = requests.get(url)
data = response.json()
movies = data['results']
```

Install MySQL on your machine if it is not already installed. Create a new database and define the schema that matches the structure of the data you wish to import. Use SQL commands to set up necessary tables. For example:
```sql
CREATE DATABASE tmdb_data;
USE tmdb_data;
CREATE TABLE movies (
id INT PRIMARY KEY,
title VARCHAR(255),
release_date DATE,
genre VARCHAR(255)
);
```

Transform the data fetched from TMDb into a format suitable for MySQL insertion. Ensure data types match the MySQL table schema. In Python, you can process the JSON data and prepare SQL INSERT statements.

Use the `mysql-connector-python` library to connect to your MySQL database and insert the data. Here’s a snippet to demonstrate:
```python
import mysql.connector

conn = mysql.connector.connect(
host='localhost',
user='your_username',
password='your_password',
database='tmdb_data'
)
cursor = conn.cursor()

for movie in movies:
cursor.execute(
"INSERT INTO movies (id, title, release_date) VALUES (%s, %s, %s)",
(movie['id'], movie['title'], movie['release_date'])
)

conn.commit()
cursor.close()
conn.close()
```

After inserting the data, verify the integrity by running SQL queries to ensure data has been correctly imported and matches the source. This can include checking record counts and sample data verification:
```sql
SELECT FROM movies LIMIT 10;
```

By following these steps, you can successfully migrate data from TMDb to a MySQL database using manual programming techniques without relying on third-party connectors or integrations.