@Anna C, I have no tips for you that you haven't thought of yourself, I suspect, but here goes:
Practice it with a light weight and make sure you do not press the weight. It's all about keeping your arm and the bell in contact with your torso and using that to get the bell moving. If your arm comes away from your torso, e.g., what happens to most people to some degree or other in the front squat, you're sunk. To this end, experiment with your rack position - the rack for a press is the tightest, and most people need to be a lot looser with the rack for their jerks. The handle should sit a little lower on the pinkie side, and the focus should be on balance and connection, not grip.
First practice is simply dipping then jumping up and getting the bell to move up and away from your torso without you doing anything else.
It's very much a coordination thing - once you start the Drive phase, it all happens very quickly. You can pause at the first Dip, and you can pause at the catch (after the Drive and the second Dip, which happen in rapid succession) with bent knees and a straight arm, but you can't stop anywhere in between.
Let me know if some of that helps, and I'd be delighted to look at video for you if you want to email, PM, or post here. Allow me to say that you contribute a lot here and it would be my pleasure to return the favor in some small way.
-S-