ડાહી બાઇને તેડાવો ને ખીરમાં મીઠું નંખાવો.

ḍāhī bāinē tēḍāvō nē khīramāṁ mīṭhuṁ naṁkhāvō.

Literally: Invite a clever lady and have salt put into the sweet rice pudding.
What it means: Said of someone who pretends to be wise but only ruins a simple job with foolish interference.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.