I got started with a starter kit from Tandy. Probably alot of us did. It helped to solidify my thoughts about the craft and is now a passion. can't say I've 'replaced' any tools but I sure have gotten some better ones. And with many crafts, the more you practice the better you get. And, also, like with many hobbies, you can spend as little or as much as you want.
But in all seriousness, coming from a leather noob, too. Welcome! I learned so much just by searching the forums. An unbelievable amount of treasure from really knowledgeable and helpful folks from all over!
~JL