You are learning to use new muscles with a fingertip grip, so it will take some time and your wrist will be sore for sure. I used to get the "popping" feeling too, but as my wrist strengthened and my form improved, it doesn't happen any more. A few weeks of practice will make a huge difference.
As far as getting a feel for the right type of release, the best comparison I have hear is throwing a football with a spiral underhanded. I am sure some of our coaches on here can give you a more techinical and useful description and instructions, but for me personally, throwing a football underhand is what really clicked for me to understand.
Timing is another big factor on getting the release down too, another thing that will come with practice too
Below is a link to a foul line drill you can try that won't put as much pressure on your wrist as a full swing to get a better feel for the release
http://www.youtube.com/watch?v=Ah2LUI4Y0nU
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