Begin by accessing the GitLab repository that contains the data you wish to move. Clone the repository locally using Git. Open a terminal and run the command:
```bash
git clone
```
This command will download the repository contents to your local machine.

Navigate through the cloned repository to identify the data files you need to transfer. These could be CSV, JSON, or other data files. Ensure that you understand the structure and format of these files to facilitate subsequent steps.

If necessary, transform the data to ensure it matches the schema of the MySQL destination. This may involve converting file formats, cleaning data, or restructuring it. Use scripting languages like Python or shell scripts to automate this process. For example, a Python script can be used to read a CSV file and modify it as needed:
```python
import pandas as pd

df = pd.read_csv('data.csv')
# Perform transformations
df.to_csv('transformed_data.csv', index=False)
```

Ensure your MySQL database is set up and running. If not, install MySQL and create a database where the data will be stored. Use the MySQL command-line tool to create tables that correspond to your data:
```sql
CREATE DATABASE mydatabase;
USE mydatabase;
CREATE TABLE mytable (id INT, name VARCHAR(100)); -- Adjust schema as needed
```

Convert the transformed data into a format compatible with MySQL import commands. CSV is often a good choice due to its simplicity. Ensure the file is organized with columns matching the MySQL table schema.

Use MySQL’s native import capabilities to load the data into your database. The `LOAD DATA INFILE` command can be used from the MySQL shell or a script:
```sql
LOAD DATA LOCAL INFILE '/path/to/transformed_data.csv' INTO TABLE mytable
FIELDS TERMINATED BY ',' ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 ROWS;
```
Adjust the file path and delimiters as necessary to match your data file format.

Finally, verify that the data has been correctly imported into the MySQL database. Run queries to inspect the data and ensure that all records are present and accurately imported. For instance:
```sql
SELECT FROM mytable LIMIT 10;
```
Check for discrepancies and make adjustments as needed to ensure data integrity.

By following these steps, you can manually move data from a GitLab repository to a MySQL database without relying on third-party connectors or integrations.