Its just a matter of practice and maybe a little natural aptitude. I frequently work in coffee shops, restaurants and bars. Once I have headphones on and music

Its just a matter of practice and maybe a little natural aptitude. I frequently work in coffee shops, restaurants and bars. Once I have headphones on and music playing that's a signal to my brain that its time to concentrate. It also helps to choose your seat so that you wont have people brushing past you.