Swap Magic discs will force NTSC output from PAL games with no additional steps needed, and will work for both the original version or a copy. If you're using an original disc and it's dual layer, you may require some additional steps, but other than that you're good to go.

I've noticed when using PS1 or PS2 PAL games forced to NTSC my old as dirt CRT TV, you lose a bit of info on the top and bottom of the screen, but most games have an option to modify the screen size and orientation. I'm perfectly content with this than dropping the cash on an expensive converter box that costs more than my TV is worth.