As most of above have replied... If you can post and question on this forum and if you can read the replies you are getting here, it means you know English well... And if you know English well you should be able to read and follow the instructions of cic.gc.ca
Simple..
Go to an agent only if you case is complecated... Such as previously rejected entry to Canada or serious criminal cases pending on you..

Lawyers are being used by aspiring immigrants to 'arrange employment' or 'arrange for uncle, aunt, facebook friends' for provincial nominee programs. Reading gc ca ab cd will not help in such cases , Lawyers do that kinda help.
Justin, Sunil Can you pls highlight under what program / category your agent is lure-promising you in ?