i used the desoldering iron i bought from radio shack the one with the red ball on it. Then i just sucked the solder off then removed them, no worries with ripping traces with the desolder braid, the desolder iron i believe i have is a 45watt, you hold it on the solder for few seconds hold the ball pressed in before you touch the solder, then after you heat it up, release the ball and suck the solder up. Then used my 15/30 watt solder iron and i used it on 15 watt setting soldered my new LEDs on there. to find positive and negative, you look at the traces. the shorter traces that meet eachother are the ground, and the longer ones that go across the board to where the wires connect in are the positive. No resistors needed. i soldered in red and white to match my smoke xbox that has red and white LEDs. I know it already had red LED on it, but mine are brighter.