Dual Hard Drive install procedure

Both methods work here. I think the video can explain shifting the parts aside better visually Vs static web pages. Which is most likely the reason the other method was chosen.

I would say the risks of damage are about the same as you could damage the cables by forcefully yanking on them Vs having the sharp metal edges of the optical player or HD carrier snag the ribbon cable as you sneak the optical drive out and the HD or SSD in.

Do what ever you are more comfortable with. This goal here is to not damage anything in the process ;-}