Ooh, that's excellent Zebramatt. That's actually something I've done in the past. I just haven't had the time this time around. Although, you have to make sure that you aren't sort of 'scripting' the emotions as well at the same time. Otherwise, your performance won't be as easily dynamically 'shaped' as it otherwise should be... since, after all, I've heard stories of many plays that don't go quite right.
What ended up happening was, after all my practice the one day, I woke up the next day feeling a lot better about it. My problem areas were smoothed out just by sleeping on what I had practiced, and I recited it over and over to be sure that I could recover from any mistakes. It ended up being partly-improvised almost, though I actually remember catching all the departments that I was dealing with, which I didn't always do while practicing. Overall, probably was at its best when I performed it in front of the director and all that.
Same with the singing. There were a couple bits that weren't quite perfect, but it was better than any time that I had practiced it, I'm fairly certain of that.
So, after all's said and done, I've got a callback tonight! I need to study the scripts and one of the songs for it today, so my work's not quite finished yet.