We've completed WordPress projects of all shapes and sizes and you can learn from that experience.
This free 26-page whitepaper is filled with information for considering outsourced service providers including:
"Ever since I’ve found Codeable, I haven’t been back to oDesk/UpWork because it’s hard to find somebody reliable. Everyone on Codeable is a professional. I’ve used some of their help for several things like little tasks, speed improvements, and of course some theme customizations. I've never had a problem with anyone on Codeable: it’s always been straightforward, good communication, efficient."
Ian Garvie, founder of Promo Work