W hile Diego Simeone is trying to ratchet up a lot of noise around Arsenal , Mikel Arteta has been quietly repeating the same message over the past few days. He has reminded his players they have a home game to get to a Champions League final. The biggest fixture of their club careers, from the most familiar environment. “It's amazing to play this game at home,” Viktor Gyokeres said of the second leg. “We know what's at stake, and of course, we have an amazing opportunity.” A staff member went even further, stating, “You wouldn’t have it any other way.” You might have a different opponent, though. If the setting sounds so enticingly simple, Simeone has been doing his best to complicate it. The belief from insiders at both clubs is that the Atletico manager wants “Arsenal to lose their heads” - to make the game a battle. The great challenge for Arteta and his squad, then, is to stay composed.…