You may not now but there is a way which you can use Apple built in character pallet to easily input characters into any document.
To do this you first need to put the language widget in the menu bar. This is done by going System Preferences > International > Input Menu > Show Input Menu Bar.
This now gives access to the language section in the menu bar.
From this you now have access to the character pallet to input character which are difficult to find on a normal keyboard.
Hopefully this tip has helped, and you no can input difficult to find characters quickly and easily.