In the Northwest Territories, because it is such a large land mass, we do sometimes have challenges with travel. That's something that is completely beyond our control.
Another concern is accommodation. If you have to book people travelling in from different areas, you have to make sure there is accommodation available. It might not be a problem in Ottawa, but it is sometimes in Yellowknife.
Reliability is also a concern. You have to make sure that you find people who are reliable and able to provide the service. Reference checking, I think, would be important.