I don't think beign smarter has anything to do with LDing. I've got a 3.75 or so GPA in college but I still only manage to have about one LD a month, but my life's kind of stressful and I don't always have that much time to devote to it. Persistence and a positive outlook are, I believe, the two deciding factors and if you can maintain both, you'll be good to go

-Amé

(welcome to DV)