It's a true enough saying, but there are at least two qualifiers.
You can only attain the level of perfection allowed by your innate skill and talent.
And you need TIME.
Practice takes time, which is often in short supply.
I can only take so many hours a day with headphones clamped to my skull, pounding out heavy rock with twice as many basses as normal in the mix.
Thankfully, the modern world makes learning songs much easier than it was when I started playing back before the Bicentennial.
I'm in front of my PC switching sources from CDs, mp3s, YouTube, and the band's website. A compact mixer and a small tube preamp for my basses take up less space than my old practice amp.
Still, I'm wiped-out and just want tonight's show to be over so I can have some beers and try to forget all the mistakes I'm going to make in front of a big crowd.
I'm scared, and that's a feeling I always used to avoid by practicing enough to really know the material.
But there's just no time...