I experience the feeling all the time, and not only about technical stuff, but everything. Even in writing (like here on the forums).
The base of the problem is that I can't even understand my own thinking. It's hard to express...
Maybe I should read more, maybe it's some disorder, or maybe that's normal but most people don't realise it because they don't listen to each other too carefully anyway.
EDIT: my overcoming of the problem is sweeping it under the carpet. Communication is overrated anyway... In reality, it's mostly just a time passing activity, and that time can be spend on more interesting things.