Hi AjaxKing!
I can only speak for my application case (common-law partner sponsorship) and as far as I understood our application guide, only certified copies (needed when a document isn't in English or French and needs to be translated) need an authorization from a notary (or other authorized person). We had a separate statutory declaration of common-law partnership proved by a notary. But otherwise it's your signature in the forms that matter. That being said, your case might have special documents that require notarizing so I think it would be easier for people wiser than me to answer if you explained more about your case and what kind of documents you are thinking about.
In any case, good luck!!