So I've been chipping away at writing this thing I've been working on, and I thought I was doing pretty well, but I'm really starting to hit the cold feet phase of writing I always seem to run into. Ugh, not sure I'm gonna be able to keep writing it.
[...]
It's less that I feel uninspired, and more that I keep second guessing myself and thinking, "this is shit"... Which I know is something that I shouldn't let it stop me because shit is relative, and hey who cares if it's shit?
...But it stops me anyway.
Compared to planning and practicing, actually executing plans is really, really hard. When you're still planning things out, everything is idealized and completely within your control, and feels like it has infinite potential. While you start actually setting these plans into stone though, you lose that sense of infinite potential that you had. You may begin to feel like the execution is being bogged down by itself, and you can't "make it better" without going back and scrapping the whole thing.
Revision isn't a bad thing, but if you let yourself keep doing that, you'll never go anywhere, and you're liable to find yourself trapped in a creative loop. Just recognize that nothing is ever going to be as amazing as you initially envisioned... in all honesty, the first time you try things, they're likely to blow varying degrees of hardness. Just try to recognize that the act of actually sitting down and DOING it is building your experience more than any amount of practice or planning can, and making you better for the future.
It's hard to notice how we improve from one moment to the next... it happens in subtle ways. Keep at it, though, and in time you'll be able to look back and see just how far you've come. If it helps, when you're worried about your skills or the end product not being up to snuff, just keep telling yourself that your pencils are plenty sharp already. And even the ones that aren't so sharp can still leave a mark.