RAFTUS has many excelent points. Start on the Main, but even with experienced folk, things go wrong. About 10 yrs ago one of our rafts wrapped and it took 5 hrs and 2 Z-drags to get off. Thank goodness we were-are experienced boaters and everyone had rescue training and each boat had a Z kit, and an extra 75 ft of rope along. Thus was an Aug trip, and only one other group passed us the entire time
Few years later on the MF, we ran into a small group- 1 raft and 3 IK's. They had broken two of their oars on day one, and everything was duck-tapped together with branch splints! This was an Aug trip, they had flown into Indian Creek, so probably @ 1.8 ft. They finished the trip fine, but something went wrong on day one.