Add One More Page Before Checkout - Simple Wordpress Task

I have a simple task. I have Ultra Simple Cart plugin installed on my website. I need a simple customization. When a person clicks checkout button, he should not go to the paypal directly. He should see all the items ordered with one text box below them to add comments. Then he should have an option to proceed to checkout. Note: If a person orders more than one quantity of the same item, the same item should be shown multiple times with different textboxes. This is a simple task that would not take more than 30 minutes. Bid your best price.