The way this works for me is that ideas in and of themselves are easy: you have a mental image of how it works (a web page!) and maybe articulated a few sentences about how the parts fit together. The thing is, implementation is much more complicated and tedious than this. "Oh, a site with users, posts, likes, tags, and search." Then you start getting into it and parts start taking you a week and then your brain starts tumbling over itself, conflicted between how easy the idea is to explain and how involved the production of it is.

Let's go to the redoubtable Yegge and his concept of "Shit's Easy Syndrome":

http://steve-yegge.blogspot.com/2009/04/have-you-ever-legali...

Stick with it. The set-up is long, but it pays off handsomely.