One of the things NW Grateful Diver taught me, when I was new, was not to exhale when I push the exhaust button on the BC. If you do that, you'll need to INHALE just about the time your head gets underwater. Instead, he had me take INHALE when I pushed the button, and as my head just got underwater, EXHALE hard and hold it for a count of three or so. That will get you about three feet underwater, and it's pretty easy from there.
The other thing he had me do was cross my ankles, so I couldn't kick my way back up to the surface. That's another big new diver problem, especially if you're a little out of balance. You start kicking to try to keep from falling over on your back, and kicking drives you straight back up to the surface.
Sorry the Frenzel didn't work for you right away -- IIRC, you had some airway control issues with your first class, too, so you may be one of those people who has some difficulty isolating the necessary motions in your hypopharynx. Keep working at it the way the second article describes; it does make life much easier.
The other thing he had me do was cross my ankles, so I couldn't kick my way back up to the surface. That's another big new diver problem, especially if you're a little out of balance. You start kicking to try to keep from falling over on your back, and kicking drives you straight back up to the surface.
Sorry the Frenzel didn't work for you right away -- IIRC, you had some airway control issues with your first class, too, so you may be one of those people who has some difficulty isolating the necessary motions in your hypopharynx. Keep working at it the way the second article describes; it does make life much easier.