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The expression ما حك جلدك مثل ظفرك leads to the rejoinder, which is فتولّ أنت جميع أمرك, which explains its meaning.

When translating a common saying like this one, especially one using a metaphor (as that of the scratching of an itch), one has at least three options:

1. Translate it literally, which, in this case, would probably be just as communicative in English, depending on how it is phrased.

2. Come up with another common saying that may use a different metaphor or no metaphor at all, but encourages the same virtue of self-reliance and discourages the overuse of outside help.

3. Not translate the expression, but rather explain what it points to.

My answer here takes option 2. This is not an endorsement of option 2 in all cases. It just happens that the English saying that I suggest is well known, carries the same meaning, which is readily understood by most. In some cases, a higher degree of literalness is stipulated by the project parameters, so a substitution of another saying or an explanation of the meaning would not work.