Honestly, doing it yourself is hard to screw up, 3 wires at each end, only issue is if u do manage to screw it up ur going to start a fire. It takes a very small amount of electrical knowledge to do this, if u havent got any dont do it. Calling an electrician in to do the work is a great idea, but u need to make sure u have everything concealed when he comes, best to do it now while your still putting things together, he may not realize what the plug and room is for.
Doing something as simple as changing the voltage in the breaker and re-wiring a socket shouldn't cost more then 100 bucks and an half hour worth of his time.