I didn’t use any tips on gathering resources however I did do this co-op.
I’ve done this on 2 occasions now and both times I’ve managed to get the spider stuck slightly in the wall and he has a hard time attacking you. Me and my partner just lured him to a wall has his legs got jammed. When you’re attacking the boss just jump so the little spiders can’t hit you, I ignored most of them.
If you’re struggling try this, I have attached the link below to my attempt where it glitched, as it was an Xbox recording just skip through until the fight starts.
Fight Starts at 01:00 minute