Replacing instrument cluster
May not help you if you have already damaged your trim but I found while replacing my instrument cluster that using an inflatable leveling tool that you can get a Lowes or Home Depot will push up the top of the dash without damaging the trim. I included my instructions on how I did that above along with the link to getting the tool at Lowes in the link above. Also have on that post the Youtube video I used to show how the tool works on our dashes.
I'm sure Tony will chime in on this but a few things to note before you attempt these types of MCU replacements remotely. Most of these should be common sense:
Roll down your windows! If you remove all power you won't be able to get into the car from the outside easily (I was going to keep my doors open but scared I would walk by and accidentally shut one)
Be comfortable with getting to the high voltage service loop and removing it
Be comfortable with removing terminals on the 12v battery
Have a 12v battery tender on hand as it might be a few days while the eMMC cards get shipped around
Don't work on any electronics on carpet or anything that can make static. I should have gotten an ESD mat to work on but I grounded myself
Have anti-static bags to ship the Tegra chip with
I was able to drive the car to the service center with the Tegra chip completely removed but I was not able to charge above 2 amps on my HPWC (normal for my single charger is 40 amp) and I did not have a schedule or PIN to drive enabled on my car. That doesn't seem to be the case with everyone but assume you won't be able to charge.
My car wouldn't move at all with the MCU completely removed.