How to navigate around London Underground

How to navigate around London Underground:

Use a map of the underground to note which line your starting station is on (the easiest way is to note the colour).
If they are two different lines, make a note of where they cross which is where you will need to change trains.
Work out which direction you will need to travel in (ie eastbound, westbound, northbound or southbound) OR make a note of the station name at the end of your destination line.
Then note which line your destination station is on.

Signs and maps situated at the entrance to each station or each line will tell you which line you should take, with the stations marked on them. These will be colour coded according to the line colours on the underground map.
Make a note of how many stations there are until your stop, then get on the appropriate train and count the stops until you have to get off!