Scholar Spectra Group

I have been trying to improve a few pages on my website, but SEO writing is taking much more time than I planned. I understand my topics well, yet fitting search terms into useful content without making it sound strange is difficult. I started wondering whether I should pay someone for SEO writing instead of rewriting everything myself. I still want the pages to sound natural for readers. Has anyone here hired help for this kind of work? What should I check before choosing someone?