Help with Di2 TT 2 Button disassembly and Transfer

Hey all,
Trying to find a simple video or clear manual that shows me how to take apart the 2 button TT shifter and transfer it to the new extensions I bought.

Here’s what I think I know.

-Small allen wrench to take apart the TT section to have 2 parts (already have done)
-I know I need to unplug the wire from the port which is sitting on my stem.
-Use allen wrench to undo the TT 2 button section from extensions (already have done)

What I don’t know:
-Do I take apart or unscrew the little section (2 silver screws) in the TT 2 button area that is rectangular that the wire goes into? (I am thinking NO).
-Do I just unplug it from the port and pull it through my bars and then replace extensions and I am done?

I have a race in 2 weeks and don’t want to screw anything up and be stuck with waiting on the shop to squeeze me in.

Thanks

Installation guide on page 33 should answer most of your questions: https://si.shimano.com/en/pdfs/dm/UL0001/DM-UL0001-04-ENG.pdf
.

Thanks.