You also need the whole dash out (including HVAC) to replace the auto pedal plate and install a manual pedal plate. You can’t modify them. The metal is too weak. Wreckers like to save up the manual pedal plates for conversions.
The whole process is a head fk. Mostly because of the technology attached to it all. The gearbox swap is the easy bit.
You should also check out your diff and driveshaft. Make sure the ratios and lengths are good.
People aren’t being diks when they are saying, just get a manual and sell your auto.
Even if you had the car for nothing, the cost of your time, parts and stress would come close to making it a waste.