Basically, you lift Pin 17 which is on the top row of chip legs with the front of the LA facing you. It is then the third in from the right. If you have pics, then it shouldn't be a problem. On a V9, the required VIA is a few centimetres away from the LA itself. It is on the same side as the LA6508 which you will be lifting the leg from.
One word of warning however, i'd pop the pin from the LA using a fine pin as it's easier to get behind the leg and lift from behind. Just be careful how quickly you lift and how far. Otherwise, you could find yourself with a stub of pin to solder to if it snaps off...
PS - the VIAs are the small round copper rings with holes through the middle. These connect the various layers of the motherboard together, so if you apply a little too much heat, the layers melt into each other and it's all over for the PS2
