Hello,
It's quite an undertaking, you'd ideally need a donor car that's already a manual. You'd need the following.
Flywheel
Box
Prop
Pedal box
Clutch
Clutch actuation mechanism (think it's hydraulic so new master cylinder maybe)
Manual Fuel injection ECU and matching immobiliser ECU, key, barrel and transponder
And probably more
Also needed will be a lot of time.
It's easier to just fit a good autobox tbh.
James