I try to remind myself that it is in the last part of a project (the 80% effort that appears only giving 20% of the result) that I truly learn something. Not f

I try to remind myself that it is in the last part of a project (the 80% effort that appears only giving 20% of the result) that I truly learn something. Not finishing projects is a really bad habit, even for side-projects. Try to set a goal of at least publishing your project in some meaningful form - maybe it is just a blog or a forum posting. Also be careful of vetting your ideas before you start. Make notes, paper prototypes, drawings or something that allows you to better reflect on and filter your ideas.