Barca's home is very strong, always favorite, and the away is very weak underdog, I will take over 2.5 goals, and barca -2.5
i think that this match will be a walk in the park for them, because their players are clearly superior.
Messi was in really good form in the Super Cup too and i expect great things for them.
Thats a great way to describe it however Im very sure that it wont be as easy as you have described . Barcelona usually underestimate their opponent and that is where they will lose usually. Last season they almost had the league trophy faster if only that they didnt lose couple of times and ended winning the league at the last week