I agree with the practice part.

I am of mixed minds on this. When I am writing the concept of a song, I try and go into the "zone" and try just writing something real and authentic, without giving one thought to whether someone else might like it or not. I have thousands of such ideas and sketches in a DAW that are parked somewhere for a better day.

Once I find something I LIKE, however, I start to take it more seriously, and I am not sure "worry" is the word--but a lot of CARE goes into the process at that point.

For example, if I think it will help to figure out and then record the chorus melody as a violin part so I can sing to it to get a more accurate vocal, I will take the time to do that, though it adds more time. And so on with a lot of other things.

So, I guess in the beginning I don't worry when I am just coming up with song sketches, but when I land on something I want to be pleased with, I get OCD as hell.