Begin by familiarizing yourself with the TVmaze API, specifically the schedule endpoint. Visit the TVmaze API documentation to understand how to make requests and interpret the JSON response, which typically includes show names, airing dates, times, and channels.

Prepare your development environment by installing necessary tools. Ensure you have a programming language environment like Python or Java installed, along with any required libraries for HTTP requests and JSON handling. For Python, libraries such as `requests` and `json` are essential.

Write a script in your chosen language to fetch data from the TVmaze API. Use HTTP GET requests to retrieve the schedule data. Here’s an example in Python:
```python
import requests

response = requests.get('http://api.tvmaze.com/schedule')
schedule_data = response.json()
```

Process the fetched JSON data to extract relevant fields necessary for your database. This may involve iterating over the JSON objects to select fields like show name, episode airtime, and channel. Transform this data into a format suitable for insertion into your Oracle database, such as a list of tuples or a CSV file.

Set up a connection to your Oracle database using Oracle's native client tools. For Python, you can use `cx_Oracle`:
```python
import cx_Oracle

dsn_tns = cx_Oracle.makedsn('host', port, service_name='service')
connection = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
```

Design and create a database schema that matches the structure of the data you fetched. Use SQL commands to create the necessary tables in Oracle. Here’s an example of a simple SQL command to create a table:
```sql
CREATE TABLE tv_schedule (
id NUMBER PRIMARY KEY,
show_name VARCHAR2(100),
air_date DATE,
air_time VARCHAR2(10),
channel VARCHAR2(50)
);
```

Write a script to insert the transformed data into your Oracle database. Use prepared statements to insert the data to ensure security and efficiency. For example, using Python and `cx_Oracle`:
```python
cursor = connection.cursor()
sql_insert_query = """INSERT INTO tv_schedule (id, show_name, air_date, air_time, channel) VALUES (:1, :2, :3, :4, :5)"""
for record in transformed_data:
cursor.execute(sql_insert_query, record)
connection.commit()
cursor.close()
connection.close()
```

By following these steps, you can efficiently move data from the TVmaze schedule to your Oracle DB without relying on third-party connectors or integrations.