Spanish translation building construction and gardens website

I have a 200 page English site on building techniques, DIY, garden things like sheds, driveways, some of the pages are about things like insulation, roofing, brick barbecues, etc. It is simple text but needs proper translation not machine (google etc) attempt. The first language I want is Spanish. Both European and South American, assuming there are differences, it is for both. Proof reading. I believe one person translates and a better person proof reads. Please advise on your method, and show proper examples. I have a native Spanish friend to check. Will start with blocks of about 10,000 words.