MacBook headphone FPC connector replacement

Hi there!
Was wondering if I could get some advice on replacing one of those plastic connectors.. How the hell is it done so it doesn't bridge the pins under the connector. I've tried 4 times and always have some sort of bridging. Ran out of doner boards with them on now too. Is it possible to buy just the connectors from somewhere?


Take off old connector, put solder on the pads and put the new connector on and use bottom heat to melt the solder. No idea where to get them, I only use donor boards.