Should I Outsource Copy?

Our team has been sharing writing tasks for months, but lately everyone seems to be busy at the same time. Several new pages are waiting, and the unfinished work keeps growing. We have started discussing whether to outsource copywriting for part of the project. My main concern is keeping the same voice across pages written by different people. Has anyone managed outsourced copy before? Did you create a style guide or use another method to keep the writing consistent across the website?