If I was walking from the car to the house, I focused only on that action. I kept my thoughts on everything in my surroundings. If I started to worry about future events, I gently brought my thoughts back to the present moment. There was nothing I could do to get the job done any faster. I just had to take it minute by minute and let go of my worrying.
Mindfulness has an element of denial in it.
Remember that denial is a coping technique and as such it is not necessarily bad. Denial becomes dangerous when it becomes the only coping technique. When we use mindfulness, we are pushing extraneous thoughts out of our minds. Basically, we are denying their existence, or at least trying really hard to stop them. This technique did help me get through the time crunch.