I’m not the best person to respond either! What a challenge though! Is it worked flat or in the round as this makes a difference if you need to carry yarn or have a bobbin yarn waiting in the right place for you to pick up.
I’ve seen clever methods of carrying bobbin yarn for intarsia across a section for working in the round which, like many things, looks complicated but once done a few times probably turns out to be easier than it looks. It might be a technique to have a look at if you are considering working in the round.
If you have many balls or bobbins being used at once my tip is to be really conscious of which way you turn the work if working flat. The first turn crosses all the yarns over but instead of moving and untangling them all, if you just make sure you turn in the opposite direction at the end of the next row they magically untangle…you have to have a bit of faith in it!
Having boxes or bags each ball can sit in and move freely without rolling around is another tip.
And smaller bobbins of colour can be prevented from unravelling by fastening the yarn with a removable stitch marker, the ones like a blunt safety pin.