I use blinds regularly if I don't have any turkeys roosted, and when I am hunting in the late morning and afternoon. Do some scouting and find a travel corridor or any spot where the turkeys like to hang out, and set up your blind accordingly.
Some of the cheap blinds tend to be very shiny in the full sun. Some of the turkeys get spooked by the shininess of these cheap blinds, so you have a few options: (1) buy a more expensive blind; (2) rub some dirt or mud on the blind to make it less shiny; and (3) only use the blind in low light conditions (i.e., early morning, overcast days, or in the woods).
Here are a few more suggestions:
Wear dark clothes under your camo. If your blind gets hot, and you feel the need to remove your camo, a black undershirt is much better than a white one.
Close the windows as much as possible. Your visibility will be impaired, but the turkeys are less likely to see you.
Have the sun at your back if possible.
Put the blind near thick vegetation, if possible. (not necessary, but sometimes helpful)
Always pay attention to the sun - if you wear eyeglasses or use binoculars, don't stick them out of the blind and into the sun - oftentimes they will reflect sunlight, and turkeys don't like that.
Hope that helps.
