I did it with a friend 2 years ago with the aim of getting her round and we were right at the back (literally!).....managed ok and didn't get lost although it WAS a lovely day and you could see quite clearly ahead. To be honest I did keep running ahead when people got out of view just to check which way they had gone then ran back again...I'm sure you'll be fine though
The last section was marshalled and flagged too.