I once met Steve Jobs at MacWorld. I was wearing a MacPlus on my head. It went as well as you think.
iMac Intel 20" EMC 2133 and 2210 Hard Drive
I worked with the top of the screen facing me. It was very easy to brace my fingers and press with my thumbs to release the drive. I recommend doing it that way if you can.
It's true, these were super tight. I only had a T5 which worked on the first screw, but the second wouldn't budge. Ended up filing the tip off the T5 bit - presto! - instant T6.