The swap trick as it is known is when you boot up an original game and then when you have got the Black Psx screen you quickly swap the original game for the copied game and hay presto it should work, i have never tried this as i think you need an game enhancer plugged into the back of the Psx console for this to work.

If i were you i would buy and boot cd from

http://www.kanection.co.uk
http://playstationmods.com

it is called the Psx-exchange or something like that and it doesn't need you to have your console chipped, you can plays copies staight away.