That 10 second trick saved my bacon when i first installed safestrap. i had a "black" screen, but it was actually dimly lit and wouldn't respond. the ten second thing got it up and running.
The new ROM goes on the "safe" side. The "unsafe" side is where your original ROM goes, just in case you mess things up and need to go back to stock.
"Safe"=safe to mess with
"Unsafe"=not safe to delete or modify