Carno trap: this is better with 2 people but 1 is possible but difficult.
Get 8 stone pillars, place down 3 in a straight line, 1 across at the top, and 3 down the line again. It should look like | = side pillars, _=top pillar. Once you have that set up (it should be only 7 down) grab your carno to agro on you, run into the trap, and once they are in there, have your friend place that last pillar so he’s trapped, and now just tranq it :)
If you’re solo, do all this except when he gets in the trap, you might have to take a hit or two when you wanna place the last pillar. Good luck!
Rookie taming method (worked first time):
1. Craft a larg bear trap (and about 15 tranq arrows)
2. Find a carno out In the open and easy to see/fire at
3.get carno to aggro on you (somehow) and walk into the trap
4. Tranq it quickly before it breaks out