Manual Script writing

I am looking to have a manual written for a simple, easy-to-use product. It needs to combine both an update of an existing manual, as well as the creation of a new manual. I am looking for someone experienced in writing and editing user manuals who can take the input provided and create a friendly, but professional, manual that can help users utilize our product. The manual must also be formatted in a way that makes it accessible and easy to follow. We are looking for someone with at least 3-5 years of experience in manual script writing.