hi james
i have to admit to not having read the book though i'm familiar with the practices i'm not sure how they should be combined and used.
my main concern is you not experiencing any body sensations/feelings when you bring the difficulty to mind it doesn't give you much/anything to work with.
doing the WWD twice a day is ok if you can cope with that.
if you do start to really experience strong emotions and their sensations then stick with once a day.
grounding yourself and then following wwd is ok too though it does mean stopping to switch it on, which isn't too good.
you do need a really good grounding in this practice, firmly out of your head/thoughts and grounded in the body.
if you want to try our WWD which is around 20 minutes long then it's here for download
http://sdrv.ms/1bFFU3D it does what you suggest in grounding and then following but it does it all in one so no need to stop.
it is part of our MBCT mindfulness course.
it follows what you've been doing with the book/cd but is longer.
it's no different
all our in session practices are longer so it follows that all our homework cd/download is longer too.
if you find it too much then stop and go back to the book/cd.
don't force anything with this practice.
not sure if you'll get on with the lancashire female accent or not, she's no mark williams voice wise!!!!!
feel free to use it or any of the other practices.
this is our resource page so some of the folders are only relevant to our group.
hope this helps
let us know how you get on.
session 5 is important.
mick