Good luck with the WBTB 
With recall I tend to try and remember the last thing I was doing and run the dream backwards from there. I stop every now and then, holding where I was up to in my mind, and run it forward to when I woke up again to reaffirm it, before carrying on backwards again. This technique seemed quite effective for me. With a few of my longer dreams I would write these blocks down and let my focus on them fade, this allowed me to focus more on the earlier parts.
Sometimes I would also remember significant fragments of a dream, I would try to remember what happened before as far back as I could, then think about what happened after.
Anther technique you could try if you recall nothing at all is to look at your dream journal for your dream-signs. These are good to do RCs on, but you can also use them to try and trigger memories of your dreams. I have recalled several dreams by thinking about my dream signs, or current trends in my dreams.
There is also a topic “the BIG remembering dreams topic part V”