I've done one, am about to do a second, and plan to leave the logic board in this time. I've taken apart a lot of Mac laptops over the years, and disconnecting so many tiny, fragile connectors seems unnecessarily risky. If Apple's official repair process does that, it's because they know they can grab a new logic board or other parts if they mess things up. But most people don't have that luxury. So if you can avoid disconnecting all of the fragile interconnects, I think it makes sense to avoid doing so.
That said:
1. If you spill acetone on the logic board, it's all over. Maybe put it in from the other end?
2. You must remove the trackpad to keep acetone out of it. Maybe the speakers, too.
3. Throw away the plastic card and use dental floss (sawing motion) to separate the battery from the case. You can't get a card to be flat against the top case, so you're likely to deform the battery as you remove it, which poses a fire risk. Floss shouldn't have that problem.