confused a bit on chakra and jutsus :S

[tars94]

hi there, im new to the forums.

i have recently been caught up with the anime and manga. From my understanding, handseals are used to focus chakra to a certain part of the body. Once experienced with a certain jutsu, less or none handseals are needed to perform the certain jutsu. So why is it in episode 84 sasuke performs chidori with no handseals, yet in around episode 134, before naruto and sasuke have a rasengan vs chidori, sasuke performs handseals to create chidori.

Furthermore, ive never seen itachi perform handseals to create the shadow clone jutsu, yet in manga chapter 387 page 08, sasuke says 'fuck, how did he have time to perform the handseals for the shadow clone jutsu'.

im a bit confused now. can any1 help me? and refer to episodes/ manga chapters. many thanks

[tars94]

hey i just found out the reason why sasuke says that about itachi, its because itachi does them so fast no ordinary person would see the handsigns, but due to sasuke's advanced sharingan, he could see the seal.

However, im still confused about the experience with jutsus and handseals stuff i said b4, ive asked other people but they said that its just shortcuts, the autohr doesn't intend to show handsigns all the time, that cant be true can it? i also cant find any proof for my responses, can any1 help me out??