bench bleeding just means that you do it by hand. basically, you take the entire unit out of the car(which you have already done if you are replaceing them), put the assembly back together before installing it, and fill the resvoir with fluid but leave the cap slightly undone to let air that bubbles up escape. Once its filled with fluid, press in the master clyinder shaft, let go, press in the slave cylinder shaft and let go. Air will be bubbling out of the resevoir so refill the resevoir as the fluid goes down into the slave and master cylinder. Repeat the entire process until the air bubbles quit coming out and the master cylinder shaft gets hard to compress. Install the master and slave, pump the clutch pedal a few times to make sure you have the air out of the lines, turn on the car, and go for a test ride.