Hi there,
My lo is almost 8 months, so I can appreciate your anticipation of dropping the df.
This is how I have done it. I don't believe it's the method that they advocate in BW... I think they suggest dropping the number of minutes per feed.....
But this is how I have started... I just didn't do it! lol. One night I decided I would not feed him and see if he would wake on his own. I woke up at 3am and then again at 5am and the little guy just kept on sleeping. This worked for 3 nights and then we needed to give him his df two nights in a row and then back to nothing. So this is what we are workign with right now. I anticipate being woken up at night to feed him, but wake up pleasantly surprised that I didn't have to.
HTH! Good luck.