Pressing is not just running blindly at the opposition with everything you got, playing a pressing game demands a lot, physically and tactically. You have to be aware of your surroundings if you are go pull off a high press consistently, which is much easier said than done. You have to press as a unit, closing every possible way out, or press the opponent to make them play the way you want them to play. For example; make the only pass option a notoriously poor ball playing CB.
This things take time, and a team need to understand each other, have cohesion and chemistry, and we don't even have a final 11 yet! We are constantly rotating, making necessary adjustments because of injuries, buying new players, and it's going to take time to create a team that can press with success consistently.
I like what I have seen though. The energy and will to win the ball back has been exciting, and we are certainly heading the right way.