Vac Chaos is crap in my opinion, But pheraps that the latest version is good.
You need to use a Disabler for the Mem Hacks, Or VAC Will eat you.
The trainer, Well, Use it in the Barracks, Before joining a Game Lobby, If you want to be safe, But it will work anywhere, Just be careful to do not do things to get banned, That wouldn't be fun for Yas D=
Thankies
Mel