Depends on how good you want to get. Of course you can learn more and faster from a chess trainer than you can on your own, but I don't see that it's absolutely necessary unless you plan to play professionally or something.
begginer

These courses were designed to help folks just like you. And they're free!
http://www.chess.com/blog/webmaster/free-chess-mentor-courses
hi
I just wanted to know if its necesarry that i need a chess trainer? Can i learn on my own?
And any tips on building pieces?.
Thank you!