Impeccability is a matter of what don Juan called "the right way to live", taken to ever higher levels.  Orlando has always said, "Make the impeccable choice."  What he means is that everything we do involves a choice.  Turn left, turn right, go to the store or go home.  Literally everything.  That being the case, there are an infinite numer of choices, but in most cases, one choice may be seen as "the impeccable choice".  Being human, of course, we are going to be less than impeccable at times - we're going to choose the candy bar over the granola bar, but that's where the whole idea of "controlled folly" comes into play.
 
In the big picture, it's ALL just folly.  And that's a major stumbling block for a lot of warriors first starting out on the path.  We WANT to believe it all matters or that it's going to lengthen our lives or give us enlightenment if we choose the granola bar.  But the reality of it is that in the big picture, it probably doesn't make much difference at all. So warriors engage with controlled folly - i.e., I may eat a chocolate bar on occasion even when I know it isn't the impeccable choice, but I also know it's all just folly in the end, so I choose the experience of chocolate.  *grin*  (Okay, maybe that's a minor indulgence, so sue me.)
 
But on a more serious note, impeccability is essentially a matter of choosing the path and the choices that further our journey whenever possible.  It's why I gave up television, just to use one personal example.  To ME, it wasn't impeccable to be sitting like a mindless zombie in front of the tube - which was proven to me the very first evening I sat out under the stars and just allowed myself to experience the night as an entity unto itself.  Had I been in front of the t.v., I never would have seen that falling star, never would have heard the owls singing or watched the big male coyote walking like a silver ghost in the moonlight as he came up my driveway.  And what tells me I made the impeccable choice that night is simply this:  if I had sat in front of the t.v. that night, I would no longer be able to tell you what program I watched or what it was about or even who was in it.  But I will never forget that coyote underneath that silver moon - and so that "experience" became part of who I am.  The t.v. would have simply distracted me from ever having that experience in the first place.
 
But - hey - that's just me.  *grin*  A lot of very good warriors watch t.v. and maybe that's impeccable for THEM.  It isn't for ME - so again there are no rules.  Just what works for each of us as individuals.
 
Impeccability for me is also a matter of really employing the old adage:  Think before you speak.  Or:  think before you act.  There was a recent incident involving Sue, which I wrote about in the thread, A Shadow in the Night which may serve as a tale of power in a way - just my own experience with regard to learning to make more impeccable choices.

Warriors with awareness often find themselves at a crossroads - at least about a hundred times every day. Impeccability determines which road we take, and impeccability enables us to turn around if we find we are wrong, as well as giving us the ability to be both confident and vulnerable at the same time.  Even impeccable choices may sometimes lead to undesirable circumstances, but it is impeccability that will give the warrior the advantage of getting OUT of those undesirable circumstances with a whole skin.

Some have suggested the impeccability is an attempt to "live a perfect life", yet I can tell you from experience that this is neither possible nor desirable.  First of all, what would qualify as "perfect"?  It would require an agreement to even come to a definition, and so the idea of "perfect" flies right out the window for me.  Instead, impeccability to me is synonymous with forward thinking - i.e., using one's awareness to see the pathways which will be created by the consequences of our actions.  When a warrior develops the ability to do this, and begins to make the impeccable choice as opposed to clearly unimpeccable choices, s/he begins to amass personal power which, by strict definition, could be described as the energy one saves as a result of making better choices the first time. 

Impeccability is a matter of not crapping in one's own path.  And further, it is a matter of not stepping in the droppings left by oneself or others.