Connect the Dots

There are many overarching principles in jiu jitsu. That's why your coach probably gives you the same advice in a multitude of situations. So first listen to your coach, most likely he's not just giving you instructions just to hear himself talk. Second, apply the principles. If you know you need to keep your arms in, keep your arms in. If you know they can't take your back if they can't see your back, don't let them see your back. Your coach can only do so much for you, it then becomes your job to execute.