You should be able to slide it in with your fingers (gloves!). You can maybe push it but with a blunt tool nothing with sharp edges obviously (hence why no forceps).
That really depends on you and the install but based on my experience , much less or not at all. They are big and less “aerodynamic” so it makes sense. Round ones tend to spin around though.
You should be able to find many install videos in the Install video thread.