DILD is mostly the easier method to induce lucid dream...
Noting your dreams every night and being able to identify dreamsigns, is a great start to attain lucidity. Once you know your dreamsigns, it gets easier to DILD.
The school dreamsign is pretty cummon.
Make a habit to always RC when your dreamsigns occur in real life(waking state). Then in dreams you will most likely test your reality more often.