Hello, I am a native Arabic speaker from Egypt. I assure you I am able to do this job perfectly as you expect as I am a very detail-oriented person.
I can do a sample before starting the job. Delivery time would depend on how much data you need to be translated, but I can guarantee a very fast delivery :)
You also may need to specify if you need the translation to be verbatim, word by word, or to be translated according to the meaning. I am ready to start right now...
I am looking forward to discussing with you about this job, Please feel free to contact me anytime.
Thank you.