I've seen a few tutorials myself. You need to score it a few times to even get it through.
No, so long as you're careful with your cuts as the knife won't melt it as I've done a project where I needed to cut some plexiglass to create a visor.
I can do it for you if you want.
When in doubt, just take the next small step.
With that next step take a deep breath. It calms the mind.
When the mind is calm you realize the best is still yet to come.