Localizing neuro lesions requires: 1) knowledge of functional neuroanatomy; 2) visuospatial imagination (i.e., you need to be able to read maps/circuit diagrams); and, 3) the ability to OBSERVE the neurological function (and malfunction) of your patient.
#1 you can learn. #2 is perhaps learnable, but I think it is more inate. If you are the kind of person who just can't read maps and gets lost going from A to B, you may have problems with neurodiagnosis...
#3 can be learned, or at least improved with training, during med school and residency. Goethe said Mann sieht wass man weiss, which translates to "you see what you know."