Think of Zoom It as a virtual magnifying glass. It will magnify whatever is in your determined zoom area, and keep everything else the same size. This means that you don't have to lose part of your screen in order to get a better look at something.
Zoom It is so easy to use that virtually anyone can become a pro user in just a few minutes. You just have to get the hang of a few simple keyboard shortcuts. If you're comfortable pressing Ctrl + C to copy something to your computer's clipboard, you can use Zoom It's custom keyboard shortcuts.
You can magnify a large or small portion of your screen. It's all up to you. Whatever feels natural and helps you see what needs to be seen.
Some of us need a little more magnification than others. But with the option to zoom up to 500%, you never have to worry about whether you'll be able to see. Just keep zooming until your screen becomes clear.