I also asked R. (High Priestess, altho not in her sacred capacity) for some help with the arc of the story. I was having trouble identifying the conflict and therefore the climax of the story. I described the plot elements and she suggested the alternating chapters approach (his chapter, her chapter, his chapter, etc.) and said she had seen it work well even when the characters weren't interacting much at the beginning of the book. Along with some other observations on her part, that made everything just sort of click. I reworked the timeline a little bit, and kept the previous girlfriend around for the first third of the book instead of relegating her entirely to backstory, and I wound up with a beautiful, three part story, and one of the first scenes I visualized turns out to be _perfect_ for the climax/crux/dramatic turn in the middle of the book.
Who knows if I will ever actually _write_ it, but everything this long I've written before had no pre-plotting done -- I either ripped off a plot from someone else (Leia at Hazard was a ripoff of Restoree, for example) or just had sort of a free form quest (Time and Mischance). It is downright _weird_ actually knowing the whole arc of the story ahead of time. (To be fair, the incomplete novel with Hale and what'shername actually had chapter synopses written for the whole thing by about the time I was halfway through it or thereabouts. But I didn't plot it out completely ahead of time. And I never finished it.)