With regular quick release hubs and disc brakes, use witness marks to keep the axle in the same place whenever you remove and reinstall the wheel. This keeps the disc rotor in the same place and keeps you from having to adjust your pads.
Apparently if you shove one end of a discarded pop rivet into your old shifter housing and the other end into the new housing, you can just push the new housing through the frame with some zip. Maybe not a secret or amazing but I touch at least five internally routed bikes a day and my life changed today.
That’s pretty impressive.