Begin by exporting your data from Plausible Analytics. Plausible allows you to export your data in various formats such as CSV or JSON. Navigate to the export section in Plausible, select the desired data set, choose the export format (preferably CSV for simplicity), and download the file to your local system.

Once you've downloaded the data, you need to ensure it is formatted correctly for Redshift. Open the CSV file and check for any inconsistencies such as missing headers or irregular data types. Adjust the file as necessary so it aligns with the schema you plan to use in Redshift. Make sure column names in the CSV match the table column names in Redshift.

Create an Amazon S3 bucket to temporarily store your data before importing it into Redshift. Log into your AWS account, navigate to the S3 service, and create a new bucket. Configure the bucket policies to ensure it is accessible for the data load operation, but keep it secure by setting appropriate permissions.

Upload your prepared CSV file to the S3 bucket. This can be done through the AWS Management Console by selecting your bucket and using the 'Upload' option to transfer your file. Ensure the file is uploaded to the correct path as you will need to specify this path when loading the data into Redshift.

In Amazon Redshift, create a table that matches the structure of your CSV file. Use the Redshift query editor or connect via a SQL client to execute the `CREATE TABLE` statement. Define the table schema with the same columns and data types as those in your CSV file to ensure compatibility during the data load.

Use the `COPY` command in Redshift to load data from your CSV file stored in the S3 bucket into your Redshift table. The `COPY` command is efficient and supports various data formats. Execute a SQL query like:
```sql
COPY your_table_name
FROM 's3://your-bucket-name/your-file.csv'
IAM_ROLE 'your-iam-role-arn'
CSV;
```
Replace placeholders with your actual bucket name, file path, and IAM role ARN. Ensure your IAM role has the necessary permissions to read from your S3 bucket.

After the data load process, verify that the data in Redshift is complete and accurate. Execute queries to compare record counts and spot-check data against the original CSV file. Once confirmed, clean up by removing the CSV file from the S3 bucket if no longer needed. This helps maintain storage efficiency and security.

Following these steps will enable you to successfully transfer data from Plausible Analytics to Amazon Redshift without the need for third-party connectors or integrations.