Use stone building 4 foundations with door frames all around perimeter and 2 walls high. On outside place stairs on one side- this will be the side it chases u up. Once it’s in the trap knock it out with tranq arrows.
Recommend have berry gatherer with u- need A LOT of narco.
Not hard to tame them. U must come prepared. You do the hunting missions and get one bow that has around 300 dmg if im not wrong. Use that bow with tranqs you need wayyy less shots. Build a raft trap with stone door frames. Make a ramp and lure it into the trap. Dont waste narcos to keep ot down just look for some cnidarias, kill them and use bio toxin. :)