Oh no! Is it bent in near the collet or somewhere else? Yes, ebay randos for donor parts. More specific things like balance staffs, mainsprings, sometimes jewels I may buy from ofrei if the prices are not too high, because they correctly describe what they're selling.

I have a few of these.  The post is hollow on the black tool, so that it fits over the staff and the tiny pin fits in the collet slot making it easy to turn.  Frankly, I rarely use it.  But, it is there just in case. show us a picture

This is becoming almost comical. I rotated the collet slightly...pretty firm friction fit so it didn't move easily. Tried to move it a little more, and the screwdriver slipped and caught the hairspring, which then bent. It's not bent badly, but after fiddling with it for at least 15 minutes, I wasn't able to fix it. I know it's easy for you guys, but not me. So now I need to buy a new hairspring, which means sourcing, ordering, waiting 1-2 weeks...so sad. And frustrating. Any recommendations on someone with these parts? I've just been buying them from randos on eBay.

I don't think I have damaged a pocket watch hairspring but I have messed up a few wrist watches for sure. Also I use a screwdriver - don't have a better tool for it.

It is how I do it.  Often scary, but so far I have not damaged one.  Removing the balance from the cock and adjusting it on a bench block is truly safer.