S7 Sim Card Reader Water Damaged. Need help replacing.

Hi, my S7 G930T is not reading my sim cards due to water damage. ODDLY enough, the SD card (in SD/Sim Tray) can be read perfectly fine . I tried everything from calling samsung, Tmobile, and nooby repair shops. I have came to the conclusion that I need to teardown the phone and replace the sim card slot reader. Teardown seems do-able for me, but the unsoldering/soldering, I am very hesitant about. Can you refer to guides on how to learn to solder, what specific tools should i need, refer me to a national repair shop, or think of any solutions?