you'll also need, at the very least, a shifter, shift linkage, clutch, flywheel & center console/boot.

if you can't find a way to cheat your auto ecu in to thinking it is in 'drive' mode, you will need a manual ecu. if you don't want to look at your auto instrument cluster illuminate the little letters for drive mode, you'll need a manual gauge set.

there are probably other things I haven't listed that people who've done the changeover can add.