and I can see that you've worked hard.
There are obviously improvements that can be made, and here are a few comments to be going on with:-
1. Your site would look far better laid out in tables - thay are the web designer's friend, and will allow you to improve the look and the readability of the text. At the moment the pages are confusing, and tiring on the eye.
2. You've mixed the font styles too much - stick to a plain bold header and one font type and size for the body text - and apply it throughout the site. I dislike italics on the Internet, they don't help the readability and serve no real purpose.
3. As you have suggested, the text could do with some serious editing, and if you don't feel comfortable doing it yourself, ask someone who is able to write concisely and grammatically - you'll be amazed at the difference it can make.
4. I like the screenshots - they help enormously on this type of site - but again they need to be in a table. Place the images in a column on the left and the text in a clumn alongside. The table cells will take care of alignment, and will transform the page's appearance.
Experiment with tables - they aren't difficult to handle with a bit of practice, and you'll be rewarded with a massive improvement in the appearance of your site.