Its simple to block a lightsaber attack if your unarmed and skilled in martial arts, you get close to them....
IF your that clsoe then you can block the attack from the hilt and even attack in a certain way to may them drop the saber.
I got a Vid of a TKA fighting a Jedi, very interesting.....the one who uses TKA in the end wins, but he also ends up using a lightsaber <_<