I followed this with interest. I shot a round of trap from the handicap line last week with the tightest choke I have for my 870 express, a modified, and it wasn't too bad. If I can hit with it anybody can.
Still am thinking about getting an o/u, but first am finally taking a lesson as all have suggested. (The one group skeet lesson to me doesn't quite count as a real lesson since it was difficult to impossible for the instructor to focus on individual problems. Or maybe I was just to reticent to speak out in a group environment.)
Anyway, as a beginner with title to 800 holes in the sky, I vote on just staying with the BPS and spending the $$$ on shooting expenses and/or lessons.