the tip has to be very sharp and long. Enough leverage to go in the space beteen the usb and the chip chassis. You can probaby better off to bending it a little to help but avoid contracting the tip.

Make sure the soldering is a low heat, if it's the hot one the you are risking of burning or over soldered pins with lead and could potentially short circuit and end result is castastophe when you plug in the charger. You got to be real careful and tripple checks those pins carefully. it could blow up the device or your charger.

Do it at your own risk. Be sure that you see it clearly a part.

Do use needle to separating those pins. a needle will be able to separate any over soldered lead in the pins. Scratch the gaps a few times and look closely for clearance.

When you're completely sure then go ahead and test it

Good luck and god speed.