Myself.

The Process is usually

1 - Think of idea

2 - Research idea

3 - Continue researching the idea for several months, promising myself that the more information I have, the better equipped I'll be to tackle the project

4 - Idea goes from "Simple idea X" to "This will be the new Google"

5 - Get so wrapped up in the previous stage that I lose track of the simple original idea.

6 - Get overwhelmed

7 - Begin to think "Well, X does this idea better anyway, why even bother?"

8 - Sulk

9 - Forget idea

10 GOTO 1