I'm fairly new to mountain biking, and I'm using my dad's FS marin. I feel pretty sketchy around corners, and I have a hard time keeping up with the people I ride with. Whenever I get the courage to push it around a corner, I feel it slipping a bit and I get scared. I ride in AZ, so lots of hardpack, sand, and rocks.
Anyway, here is the tire. Would replacing it give me more confidence? If so, what tire would you suggest for the terrain I described?