Several Saudi respondents explained this popular expression to me under independent circumstances. A few of them also kindly offered the English equivalent expression as "haste makes waste."

Hope this helps.

Khair, in shaa' Alah.

Regards,

Stephen H. Franke
San Pedro, California
(al-Riyadh and al-Hofuf previously)

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Note added at 10 hrs (2010-01-28 00:56:10 GMT)
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This is not a litteral translation, but it equivalent in meaning:

If you cast pearls before swine, you offer something of value to someone who doesn't appreciate it- 'swine' are 'pigs'.


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Note added at 10 hrs (2010-01-28 01:00:19 GMT)
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Pearls before swine
Meaning

Items of quality offered to those who aren't cultured enough to appreciate them.

Origin

From the Bible, Matthew 7:6 (King James Version):

Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet.


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Note added at 10 hrs (2010-01-28 01:01:04 GMT)
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If you are looking for an idiomatic expression not merely a translation of a sentence.

Means don’t rush into doing something until you know how to do it.