I had to navigate the London Underground today by myself. I was able to travel from A to B without any problems. I will look at the journey planner next time to ensure that I know the quickest route.
There is a Guinness World Record for travelling around the 275 stations in the fastest time possible. I can’t imagine where you would start looking at the map, but apparently the record stands at 18 hours 25 minutes and 3 seconds. It must be really frustrating if the northern line train is going to High Barnet when you want to go to Edgware.