Purchased Homelink kit off eBay for $180, showed up at my house two days later. Only needed 3 tools to install: a 10 mm socket wrench (for the 4 frunk liner bolts), a10 mm ratchet wrench (for the Homelink module bolt) and a medium size flat screwdriver. Following the YouTube videos and being sure to install the bracket bolt from the front, only took 20 minutes to install the module and button it all back up. Very easy mechanical install. Contrary to the YouTube videos, the cable to attach to the Homelink module was not taped to the wiring harness on my y, but was instead buried behind the left front inner fender (took a little searching).
Went into the software service low voltage menu and told the system to do the retrofit Homelink install. After reboot, the software service low voltage menu showed the Homelink as installed and ran the self test with no problems.
However, no Homelink icon appeared on my main screen (like it did on my model x) so it took me a few minutes and a couple 2 button steering wheel reboots before I finally figured out that Homelink is buried on the controls screen under the home-shaped icon at the top right. Once I pressed the home-shaped icon, I was able to add each of my 3 remotes successfully.
On my previous model x I was not careful to pull the car right in front of each gate before programming Homelink, so the x was never quite right about highlighting each gate as I pulled down our long driveway. This time, on the y, I made sure to program each Homelink with the car parked right at each gate. Now when I drive down the driveway, the y makes a good guess which Homelink to highlight as I approach each gate. Very nice.
So for 20 minutes of hardware install, about 30 minutes of installing the software from the service menu, and another 45 minutes messing around learning each Homelink opener, I saved $170, learned a little more about my December 2023 Model Y, and got Homelink running for my three openers.