Cheesy tip: mount a scorpion or Arthepluora or even another Araneo, walk up to the one u wanna tame while sitting on your tamed insect and feed it. For some reason none of the Dino in game agro on insect type dinos what so ever ;)
Make 1 foundation and put 8 walls on it making a 2 high box without a lid, drop the spider into this funnel like trap, when you see it's legs show through the trap from the outside look at them directly and you can feed it, you do not need bug repellent for this
So, biggest thing no one tells you on here. If you only have repellant and no ghille, put it on and go at them from the SIDE!! Not head on, not directly behind. The side. Never aggros on you that way. From the back and front even with repellant it aggroed 3x each before i tried it this way.
Take caution when in any cave or underground. The Araneo can climb walls and drop from the ceiling without warning. Their torpor inducing bite and slowing webs can put you in a helpless situation. Also keep in mind they tend to stay in groups. If you see one there is likely two or more somewhere nearby. I strong suggest and weapon with a flashlight attachment. A pump shotgun being my prefered caving weapon.
DONT put them in a trap, once they agro on a foundation they won’t de-agro.
Use fence foundations to make a trap if you have too.
If your able the best way is to use a Karkino to pick your desired spider up. Then put on your best gillie suit spray some bug spray and sit there feeding it