Today I was with my girlfriend at her moms house. My girlfriend was walking around the house doing different things (laundry in particular). I was bored and decided to PR a book while sitting on the couch waiting for her. So I did. By the way, I am still learning to PR.
While I was PRing, I was vaguely aware that she was moving around the living room, but I had no idea what she was doing. After I finished, I was surprised to see a basket of folded towels in the laundrey basket not 5 feet away from me.
My point is that if you practice with distractions around you, your concentration will develop to where you will block them out. It does take some practice though.
Hope this helps. 