As mentioned above, it is best to place your blind somewhere early, but this is not always possible. Another factor to consider is the location of your blind. It should be placed within range of the trail or food source you are hunting while staying out of the deer's field of view. Take the time to figure out where the deer approaches.
After you figure that out, place the blind back 5 to 10 yards into an adjacent cover. You also need to consider wind direction to keep deer from smelling you. Choose a location with built-in obstacles that prevent deer from smelling you. This could be in a field close to a steep drop, a thick area, or water.
Lastly, make sure the blind is placed somewhere quiet. Remove any branches, vines, or dead leaves that could make loud noises.
Once inside the blind, keep the noise and your scent down. Keep the blind clear of debris to avoid tripping or stepping on something. Keep sunlight from leading into the blind because it will illuminate you and scare deer away. Keep windows sealed to keep noise and scent from leaving the blind. Food and water should be packed in packaging that won't make noise. Also, wear clothing that is not too shiny or makes noise.
Using a mat in your blind helps keep the noise down while walking. Use a hunting blind chair to sit for a long time.