The important thing is to carry a mirror shield with you. Otherwise, the cockatrice will quickly lower your combat stats. You can buy a mirror shield from any slayer master, or from the Grand Exchange.
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You don't you actually use it to make a spirit cockatrice puch.
By killing what your slayer masters tell you to kill which differ from each master. Train on it and do not get distracted at all if you do this you will achieve it.
Cookie Monster Cameron (terminator from Sarah Connor Chronicles... many people believe her to be a monster) Cockatrice Cerberus Charon Chimera Cyclops
There is no fast way other than to keep killing cockatrices, I must have killed over 1,000's of them and not one has dropped for me either.
RS stands for right stick. You push down the right analogue stick.