you should not making yourself into the same project for too long. give youself a time, say 2 months 3 months.
Beacuse if you hold for too long, you'll notice that by the time you are finished. You'll see there has a lot of things that you can refine it and make it better. However, your model are stuck can't change it anymore (like after you rig it and animated it). I rather start another project and push myself in a time limit.