I don’t know those particular routes but for all route planning I recommend Cyclestreets:
http://www.cyclestreets.net/ It’ll show you the best route, with options for fastest, quietest, and balanced. I was nervous as a novice and at difficult junctions I used to get off and walk the bike across pedestrian crossings. Don’t forget you always have that option. But after a few weeks I gained confidence and I am sure you will too.