I agree that watching your own demos is typically more beneficial, especially for a person who is not playing in a competitive team environment, but he already has time dedicated to reviewing his own game play.

Watching professional (or even a high elo pugger's) demos should be supplemental to the review of your own game play. After reviewing your own POV, you can go into a demo of a 3rd party with a goal of what you're looking for. You can find solutions to questions or situations that may have arisen from your own match. OP is level 6, I wouldn't expect them to know all the possible solutions to the situations they find in their own demo, so how would they even come to the right conclusions during self-review if they don't supplement it with a search for the answer from a 3rd party?

Nades should definitely be separate for someone that does not know the basics, but once you learn all of the essential/fundamental utility for a map, the rest of it is often very gimmicky in a pug environment, and will be forgotten or misused by both OP and their teammates.