Keep them going pal. The best way is to make lots of them. While it takes time to make them (I should know, iv done mine 2 times. Each time there was 9 videos and they range from 1 minute to 15 minutes) but they are worth it as it cuts down support questions. Just kill the music and put your voice in to explaine everything. Text is a video sucks as it takes away the viewing process.
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