Only fall victim to torpor from cannons and such, bring loads of narcotics because it drops real fast, once it is unconscious it must be fed wyvern milk, it takes a lot so bring all the milk you have/can get. All are level one and take 12 milk.
Tame a 100+ megatherium and enrage is by attacking creatures that give you chitin. This will give you a damage boost and a damage resistance boost. Level up melee and you will easily be able to kill a death worm