Any idea how to remove the pin that hold the battery door on? I assume the back has to come off, but then how to push the pin out the back is a mystery.

I wholeheartedly agree. Super Duper! made the task effortless.

The T6 torx screws on the side of the existing Hitachi drive fit my Crucial M500 240GB replacement perfectly. Be aware that they were originally installed into the HDD with blue Loctite, so it takes a bit of effort to break them loose.

Thanks ifixit for excellent guidance!