I see. So your difficulty really doesn't have to do with OOP at all then. The OP was saying that OOP doesn't really change your ability to use a language procedurally. It doesn't seem from your answer that you had difficulty with that.
It does sound like you had difficulty with managing complexity. That's definitely valid. It's hard to learn a bunch of modules when you're first starting out. I guess for that you just need to add a sprinkling of common sense where warranted, and manage the amount of new things you're learning.
Anyways, just was curious to hear where people have difficulty when starting out, so thanks.