If you tend to "get into the larger ones" then in my opinion that is good angling. Is it luck you fish the right spots, use the right rigs etc etc, not for me. That's all down to good angling.
Don't get me wrong, i used to think the same but I'd find the fish, find the spot, apply bait correctly and present my bait in an acceptable way, no luck involved there, just good angling. Is that big headed, no it's a fact. I'd rather be a good angler than a lucky one.