Geezer posted in the Bee-line (here's the URL http://www.aneros.com/tipdetail.php?id=23 ) that it makes a huge difference to whether you succeed, if you take good care to keep the tab and perinium really dry. Apparently otherwise things kinda slip-slide around and you dont get good pressure on your sweet spot.
I don't know how to keep it dry, I guess I'll have to experiment, but I did notice, as Geezer mentioned, that it was getting slick down there from all the lube. That must have made my sessions less successful than possible. I'll see what I can achieve tonight.....
Stay tuned!