If you are afraid of spiders, then you were lucky not be in my bathroom in the early morning hours, about 2 months ago. It was in the wee hours, about 3AM when nature called. So I get up and go to the bathroom. As soon as I turn on the light in my bathroom, I saw this on my shower curtain:
Each one of those square checkered patterns in the shower curtain measures about one-half of an inch (or 1.25 centimeters for those outside the USA). So that should give you an idea of its size.
I grabbed my digital camera, snapped this photo. Then I realized I shouldn't kill it (at the very least I would have to clean-up the gooey mess). So I grabbed my broom and coraled it outside. So, it has another chance to eat more bugs that are bigger pests.
I then compared the photo to other photos of FLorida spiders on the Internet. So that is how I identified it.