I've always said this to those interested in doing AT to MT...
if you have time, a daily to drive, don't mind spending money, etc.. then do the AT.
If you don't have a daily to drive around while the car is done, have limited wiring experience or car related experience, and or wanting an 'exact' MT FD, then I suggest selling your AT FD and buy a MT FD.
You could half ass and get the job done... but to do a proper MT swap where no one can't tell, will require time, money, and more time.