Measure 3 feet (36 inches) from the floor and mark the height with a pencil in at least three places on the wall where you will install the bar.
Use the level to make sure all three marks are perfectly horizontal.
Locate wall studs using the stud finder. Place the brackets on at least one stud and mark where the screws will go. If there are no studs available to use, just mark the location of the bracket screws.
Drill into the screw marks you made and install the wall anchors if you need them.
Screw in the brackets using the drill and the screws.
Place the bar across the brackets or through the bracket rings and and screw it onto the brackets. Test all of the screws to make sure they are tight and flat.