Begin by ensuring you have access to a Starburst Galaxy account and the necessary permissions to create catalogs and schemas. Log into your Starburst Galaxy web interface and prepare your environment for data ingestion.

Verify that your Parquet file is accessible from the machine or cloud environment where you plan to run your data transfer operations. Ensure that the file is correctly formatted and not corrupted.

Use Starburst Galaxy's interface to create an external table that maps to your Parquet file. This involves specifying the data structure of the Parquet file and creating a table definition that mirrors this structure in Starburst.
For example, use a SQL query similar to:
```sql
CREATE TABLE your_schema.your_external_table (
column1 data_type,
column2 data_type,
...
)
WITH (
format = 'PARQUET',
external_location = 's3://your-bucket/path/to/parquet/file/'
);
```

Once the external table is defined, load the data from the Parquet file into a temporary table in Starburst Galaxy. This step ensures that the data is in Starburst’s internal storage, optimizing subsequent operations.
Execute a SQL query to insert data:
```sql
CREATE TABLE your_schema.your_temp_table AS
SELECT * FROM your_schema.your_external_table;
```

Run queries to verify that the data in the temporary table matches the original Parquet file. Check for any discrepancies in row counts and data types.
Example query:
```sql
SELECT COUNT(*) FROM your_schema.your_temp_table;
```

If any data transformation or cleaning is needed, perform these operations on the temporary table. Use SQL queries to adjust data as required for your final use case.
Example transformation:
```sql
CREATE TABLE your_schema.your_final_table AS
SELECT column1, column2, ..., FUNCTION(column3) AS transformed_column
FROM your_schema.your_temp_table;
```

Once the data is verified and transformed, move it to the final table in your Starburst Galaxy schema. This step involves inserting the cleaned data into your production-ready table.
Finalize with:
```sql
INSERT INTO your_schema.your_final_table
SELECT * FROM your_schema.your_temp_table;
```
By following these steps, you’ll efficiently move data from a Parquet file into Starburst Galaxy using SQL commands and built-in functionalities, without the need for third-party connectors or integrations.