Well, listening is very, VERY important. I mean seriously, that's how you learned to talk as a baby... you didn't just lock yourself in your room for 12 hours a day and practice talking, did you? You listened to people that were good at talking and tried to emulate them. And so it should be with your guitar playing also. Way back when, there were few (if any) "Learn How To Shred In Just 14 Minutes" books and videos. People would listen to recordings and try to play what they heard. They would go to shows and watch and listen to the greats play. THAT'S where the best learning is from. Practicing without listening can only get you so far...