Once you have found a slanted surface that sorta bounces you up grab a friend and ask him to stand behind the object. Once your friend is there press the bayonet button and you should fly pretty high. If at first you don't get very high ask your friend to keep scooting back until you shoot pretty high. Most people would say that to increase your chances of shooting high on your first try you should run then bayonet your friend. The trick to bayonet jumping is within the object that you are trying to bayonet jump off. Find a good slanted object and there you go.
-BBballfanatic13
(P.S. If you find anything i posted helpful please +rep me

)