Practice with 4-5 mobs that you can easily take a beating from. When you are able to take out those 4-5 without getting hit, easily, then go out and grab 25 mobs and do the same thing.
If you are having a lot of trouble with the range, just stick with the level 18 song that has an extended 5 yard range and take 2x longer to kill everything. Most of your time kiting is spent gathering the mobs anyway.
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