1.) D/L full images and burning is flat out illegal and should not be discussed here. Read the rules.
2.)Knife/ccard is very dangerous and you will get a lot of flak for even mentioning it here. There are tutorials available. I suggest you search on it here or at the other sites like gamecopyworld or consoleworld.
3.)The double swap is also covered here and is EXTREMELY risky with a knife trick--you only have about a 10 second window to get the drive open and have enough time to swap the disk. Rushing this process can really damage your drive tray and wind up costing you more in repairs/replacement then it would cost to get a chip installed.
4.)In short, read the rules, stickies, and tutorials. You will soon understand why it is best to get a chip. Only copy games you physically have in hand. Avoid CD-Rips if you want to preserve a long life for your PS2.
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.