I do it all the time, probably half of the contests I did this year were solo. The other half my wife comes with me and she is my box runner. Someone else added to the mix at this point would be in my way more than they would be a help.
I use Yoder pellet cookers and get plenty of sleep.
"What sort of people are these charcoal masters? They behaved badly and were unconcerned with appearances. Their hair was long and unkempt and their clothes were wrinkled and old. They drank beer to and from the crab house and they made rude noises while we cooked." Tao of Charcoal