Before moving data to Firebolt, ensure your Excel data is well-organized. Remove any unnecessary formatting, such as merged cells, and ensure that your data has clear column headers. This will help in maintaining data integrity during the transfer process.

Save your Excel file as a CSV (Comma-Separated Values) file. Open your Excel file, go to 'File,' then 'Save As,' and choose the CSV format. This format is more suitable for import operations as it is plain text and easier for database systems to process.

If you haven't already, sign up for a Firebolt account and create a database. Log into Firebolt's web console, navigate to the 'Databases' section, and select 'Create Database.' Follow the on-screen instructions to set up your database.

Using the Firebolt SQL Editor, create a table that matches the structure of your data. Make sure the column names and data types correspond to those in your CSV file. Example SQL command:
```sql
CREATE TABLE your_table_name (
column1_name column1_type,
column2_name column2_type,
...
);
```
Replace `your_table_name`, `column1_name`, `column1_type`, etc., with your actual data specifications.

Firebolt requires your data file to be accessible. You can use Firebolt's S3 bucket or any other accessible cloud storage. Use Firebolt's web interface or a command-line tool to upload your CSV file to your chosen storage location.

Once your CSV file is uploaded, use a `COPY` command within Firebolt to load the data into your table. An example command might look like this:
```sql
COPY INTO your_table_name
FROM 's3://your_bucket_name/your_file.csv'
CREDENTIALS = (aws_key_id='YOUR_AWS_KEY_ID' aws_secret_key='YOUR_AWS_SECRET_KEY')
FILE_FORMAT = (type = 'CSV' field_delimiter = ',' skip_header = 1);
```
Ensure you replace placeholders with your actual bucket name, file path, and AWS credentials.

After loading the data, perform a series of checks to ensure that the data has been accurately imported. Use SQL queries to count rows, check for nulls, and verify that the data types and contents are as expected. This ensures that the data migration process was successful.

By following these steps, you can move data from an Excel file to Firebolt without the need for third-party connectors or integrations.