I keep my "system" , if I have one, as simple as possible. Buy something I like if it
has been beaten down further than is seems it should have. Let someone else take
the losses. I hate that feeling of seeing something I was excited about take a dive
right after I bought it. Of course sometimes you think it has been hammered enough
and then find out it isn't over yet. That's an argument for not doing all the buying (or
selling) at once, but spreading it out as an admission of fallibility in fathoming the bottom.