Is used car evaluation necessary?

I am looking to buy used car for the first time, is it necessary to evaluate from dealers or shall I evaluate myself, which will be more effective?
Also help me with the used car evaluation guide so that it would help me out to evaluate my car.
Asked Apr 13, 2016

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.