There are two kinds of perfectionism that are useful creatively.

One is what you could call "polishing perfectionism." That is, you care about every detail, because you know that the whole is made of parts, and anything off about one of them maybe really could negatively affect the whole. This is what most people usually mean by "perfectionism."

To counteract it, remember that in the beginning, there is nothing to polish. You can polish as you go, but that may be less than perfect as an approach. It can stop progress entirely, or short-circuit discovery. Polishing may be better - more perfect - later. (Perfectionists often like to procrastinate. Sneaky, maybe, but isn't it true?) Also, it helps to look at the words wabi-sabi and sprezzatura, and to remember that a lot of the charm of the hand-made is in the organic unity achieved from imperfect pieces. There is no such thing as every piece being perfect, only a perfect feeling of unity.

The other is what you could go all-out and describe as "creative perfectionism." That is, you are not motivated to make the kind of thing that already exists. It has to be new. (You can already see another bid for excessive procrastination, can't you?) This can work against craft, because so much of craft is learning from the masters and the skillful practitioners. Nothing is wholly new. Everything's made of quarks and bosons and spacetime, at the bottom. Everything's a pattern. All pattern is information, all information pattern. But patterns that are substantially fresh and new and exciting - this is entirely possible. Finding these can be very difficult, so creative perfectionism is about searching for what's actually new and good, not just settling for the tried and true, sometimes not even happy with "tried and true, with a twist." Like polishing perfectionism, this can block you, first because it deemphasizes craft, and second because while you are searching for the actually new, you are often not busy practicing.

To counteract this kind of perfectionism, remember that, much as polish can come later, and even better for that, inspiration, too, can come later. It's often in the middle of work that you see how to twist and turn and end up with something new. You are often very well served to begin with craft, begin with the tried and true, and keep pushing as you go for something unexpected. In other words, it is a near-constant frame of mind. It is usually not something accomplished up front, before even beginning.

You may be prone to both kinds of perfectionism, and to procrastination. I am, so I know what that's like. I have no other data, but my understanding is that these all tend to go together. One of the Achilles heels of people with perfectionism is that we know it can push what we do to a higher level. But we also know how exhausting that can be. As the saying goes, "There's the first 80%, and then the other 80%." There's an enormous difference between "maybe good enough" and "we did everything possible." Sometimes that difference is at least as much effort as it took to get to "maybe good enough." It can even become far, far more effort. But it's also true that it's absolutely necessary to finish things. People with a perfectionistic bent do not suddenly become deaf and blind when they accept that much of what they do will not be finished to their satisfaction, and that they will experiment with and practice on a lot that is hardly new at all. As long as you keep the searching instinct alive, and keep moving in one sense or another, your perfectionism is doing what it needs to do.