Sometimes there's a better way to say what we mean. Other times our gut is correct. But you're right. Writing is not easy, far from it. I do believe some parts of it become more second nature over time. We all have our weak and strong points. Description is a strong point for me. Plot is not. Not sure if it ever will be honestly.Nothing's ever easy.
I agree with Skip: just write. Like, it's good to have discussions and think about these parts of the craft but ultimately the only way to grow is to practice, practice, practice. I'm a firm believer that our subconscious tends to know what it's doing whereas our rational, conscious mind is more critical. If we let the love of writing and that passion for words take over we can produce some pretty amazing stuff.