You can say 'If you don't dare to tell her, I'll do it myself'. or 'If you don't dare tell her, I'll do it myself.' You need to put 'it' because 'I'll do' without an object doesn't make sense.
May 8, 2011
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It is incorrect.
If you haven't got the balls to tell her, I'll do so myself.
May 8, 2011
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