The hardest part of upgrading the VTX is removing the original one without pulling the pads off the controller board. The 2 connectors can be cut just above the flight controller board and from there it’s just a case of cleaning up and remobving the remaining solder and pins. The same connectors for pos and neg as well as Tx and Rx lines can be used fo the new VTX.
Upgrading the Video Transmitter
This video shows the process of mounting and wiring up a replacement VTX – Upgrading the VTX