With regards to the student of knowledge needing to have a teacher, the Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah comments:
And there is no doubt that the teachers will be questioned about the students because they are their shepherds; and every person is a shepherd and will be questioned about his flock.
The students are in need of the teachers and the scholars with regards to direction and guidance because the scholars have gained experience from matters which the students have not. And with them are (aspects) of knowledge which the students do not have.
Therefore the student is in need of the teacher from the aspect of knowledge and the aspect of actions (which bring about) experience.
Thus it is binding upon him to have the utmost eagerness to select the teachers who are known for knowledge and who are known for trustworthiness and religion, and known for their sound methodology and for their tending (to matters) in a correct way such that he can take from their knowledge firstly, then from their manhaj secondly.
Quoted in Wasaayaa wa tawjeehaat li tullaab il ‘ilm pages 199-200 by Nasser ibn Najam