All you need to do is to know how to save images as wallpapers, and there you go! After realizing that he might be selected and preparations would be needed for the coming war, Kakashi initially decided to return to however the Sand Siblings and Tenzo told him that politics is not of any use to them at the moment.
His long career as a jōnin, and formerly as an Anbu, have only expanded his knowledge, allowing him to handle virtually any situation.
He also has considerable skill in shurikenjutsu able to pin down an opponent with a quick barrage of kunai.