I would recommend cleaning all the solder off the area to be soldered. You should be looking at just a tinned area, just colored silver by a very thin coat of solder. There’s a tool called a “solder sucker” in tech circles, about $6. Bucks local parts store. Use it to help clean the area. Once cleaned, tin your new connectors before installing them, put them in place. Now your soldering solder to solder on the board. Just a tiny bit of solder will work and this way you cut down on heat issues. I’ve seen the foil traces curl up off the PC board due to too much heat. Go slow, make everything perfect then place n solder. It would be a good idea to wear a static band that’s grounded as a lot of these chipsets can be damaged by static charges on your hands. For what it worth