Here's a how to on just swaping out a ATX trans from a mk1 to show sort of what you're in for just on the removal:
Now add in the headache of replacing that with a manual trans. It's been done on previous models and imho not worth it on such a new car. Your best bet is to trade it in and take the hit on the depreciation while you still have some value left on the car.
12' Ox White SE Sedan 5spd 1/4 mile-15.8735@90mph
Mods: FSwerks Race Exhaust, K&N Typhoon SRI, MS3 CP-E RMM, Tuned By: Tom, Steeda STS, Eibach Sportlines, Steeda Rear Sway Bar and Anarchy Motive GM Shiftknob