I learned to make the (single) Drizzle Stitch by Sharon Boggon when I took part in TAST (Take A Stitch Tuesday) in September 2012. Take a look if you want to go down Memory Lane and see the Drizzle Stitch used for hair on one of my stumpwork portraits.
I think I have come a long way since then, so now it is time to learn the Double Drizzle Stitch. Again I will learn it from Sharon. She has good instructions in her excellent book:
What you need are: two threads with a good twist, like Perle Cotton.
A milliner or sharp needle with an even width.
I also recommend a pincushion with a firm filling, like this Chinese one. Inside is polystyrene (you know the blocks of white packing material). Or use an eraser. Something the needle can stand firmly upright in.
So let's get started:Begin by threading the needle with two strands of thread. Make a knot and come out to the front.