... and never leave the towbar engaged if your hand isn't on it. There have been two incidents at our airfield where the towbar wasn't removed before takeoff.
One ended happily one did not.
Where I was taught to fly you were fined if they ever found the towbar attached without being attached to a part of your body. I just got in the habit of removing it and laying it on the ground.
You will probably find it easier to push it rather than pull it, this is easier for people helping you as well, because they can push on the leading edge of the wing.