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The sloppy work thing would bug ME, I re-built my carbs once on another engine, I recall it was NOT that bad, buy a re-build kit from a "GOOD" outboard shop, they can and SHOULD walk you through it, or just drop them off to be re-built properly, "Tarpun" is right, the wrong move here could be expen$ive in the long run, and it could be a "Boatless" summer if something is done wrong, Not worth it.
If you're NOT sure, I would drop them off at a reputable place for the re-build, bolt-on and go.
mw