I did it fixed last year (for the first time) and loved it. The only steep hill is very short (in Finchingfield) and all the others are perfectly fine on a standard road gear of about 70". One long descent to Sudbury with traffic lights at the bottom, and obviously you have to hold back on some of the descents, but it's all perfectly fine. As with a road bike, you have to stop when you reach the water.
(Also talking about the route, I know there isn't 'the one' and I've seen a few, which one is the most 'official' one, anyone got a link?)
I really wouldn't worry about that too much. As others have said, you'll be led along (see what I did there?), and you can pick up a route sheet at the start. Obviously, forget GPS and all that nonsense.
As for the route though, I'm afraid I don't do anything without GPS, I both like recording my rides, and I want to have the safety of a route that I know will work as a last resort fallback...
I can only repeat my advice of forgetting about all that for the Dynamo. It's really not at all like any of your other rides. By all means still record your ride, but wayfinding will be the least of your worries.
Ive literally put Hackney to Dunwich into garmin connect for just in case. Get the feeling even on the night there will be hundreds of different routes taken
I did it fixed last year (for the first time) and loved it. The only steep hill is very short (in Finchingfield) and all the others are perfectly fine on a standard road gear of about 70". One long descent to Sudbury with traffic lights at the bottom, and obviously you have to hold back on some of the descents, but it's all perfectly fine. As with a road bike, you have to stop when you reach the water.
I really wouldn't worry about that too much. As others have said, you'll be led along (see what I did there?), and you can pick up a route sheet at the start. Obviously, forget GPS and all that nonsense.