Today on our veranda I started to pray the Rosary with a brand new rosary which I had made yesterday but which has not yet been blessed. I was dismayed at all the distractions I had to deal with, and how difficult it was to pray. After I managed to get to the third Hail Mary with a great struggle, I went in and got a different rosary which had been blessed, and suddenly I was able to pray and ignore the distractions.
However, when I started praying, I had a big sneeze which delayed my prayer until I could go back in get some tissue paper and take care of business. I think Satan was doing his best to keep me from praying the Rosary, if not by distractions then by making me sneeze, but he lost in the end, and I finished the Rosary and felt victorious.
I readily admit that this may be psychological, but it sure made a noticeable difference. I suppose this could qualify as a special grace that comes from praying with a blessed rosary in your hand.