if your case is straightforward then you can apply on your own. As hiring an immigration consultant is quite expensive. I was in canada since past 8 years. i had renewed my work permit on my own. I was also not sure about my PR process through CEC. Now i think i should have applied on my own.(nothing against my consultant but he is expensive).
Print out all the forms under CEC. start filling up the rough copies. make sure you give every minute details which has been asked for. Also, if you havent given IELTS, please kindly start preparing for it & make sure to ace it. make sure you write your own reference letter & talk to your HR dept head for the same before finalising it on their company letter head...
I have messaged you my number & email. If you need any guidance or help, feel free to get in touch with me...