When I started using Kompozer I was very scared too. I made a lot of mistakes along the way, but I was surprised at how easy it was once I got the hang of it. Now that I know what I'm doing, I'm glad I made the transition.
I can just suggest to read SBI! tutorial and watch the video a couple of times. And play around with Kompozer before you start to actually build pages. If you are using C2, the SBI blog, or the mail out manager, make sure you read up on that as well.
And from personal experience, if you run into a problem and want to ask questions, you'll get an answer from this forum much faster that the SBI! forum. But you should still read the faq's and browse through the different post on the SBI forum. There's a lot of helpful information there.
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