Having never seen one of these boxes before Friday, I set two up, the first took about 35 minutes, the second about 10/15. I set them up using Wooshmans tutorial and can heartily recommend it. If you can follow instructions and have a compatible USB stick, then you should have it set up in no time at all.
Considering the premium mark up on these boxes set up is around £60, I would certainly do it your self.