Wouldn't you rather be reclining like a cat on a mat?
If I am honest, I am getting a little bit tired of painting cats. But I am persisting. What good is a self imposed challenge without a bit of self discipline? It is always quite fun once I get into it, but I am finding that I seem to have a bit of reluctance to face the page at the moment and put another cat on it.
The beginning of a project can be a bit easier. There is a bit of novelty, it's all rather exciting. But once the initial excitement subsides you have to decide whether you have the determination to keep going. If the 'why' behind your project is still clear to you, and still important, that will help you keep going. If you sit around waiting to feel inspired, or to just 'be in the mood', your project's chance of success diminishes drastically.
Creating something new is hard. Don't get me wrong - it's fun too. But when it is hard, you need to remember that the only way to get beyond that beginner stage is to keep going, whether you feel like it or not. Steven Pressfield calls this 'Turning Pro'.
There comes a point in your creative endeavour when you have to make a decision to stop approaching your project as an amateur and treat it as a professional practice. Even on days when you would rather just be reclining like a cat on a mat (as opposed to painting one).
"I write only when inspiration strikes. Fortunately it strikes every morning at nine o'clock sharp." W. Somerset Maugham