I heard that, yes, the dealer can turn off the DRLs and may charge for 1Hr of work. I hope so because I want to do the same.

I haven't tried to remove my comfort seat headrests but I'll check tonight. I did remove the rear headrests and, if I remember correctly, they simply pulled-out - albeit with a lot of force.

Usually, if you need to do something other than pull, there's either a pin hole or a tab/button at the base of headrest that needs to be pushed in while pulling out the headrest.