There are many routes across Rannoch Moor but I will assume that you are referring to the "easy one" from Kingshouse to Rannoch Station. If so there are no problems other than wet feet. There is a small diversion around Black Corries Lodge but other than that it is an easy path all the way.

Thank you very much Peter. I thought it might be dangerous bog in parts. Wet feet I can manage. (Yes I was referring to the Scottish Hill track route)
Joy