You don't really forcefully lucid dream, you learn techniques that help you determine whether you are dreaming or not.
Some examples are not being able to turn a light on or off (because lighting in a dream is often fixed) .. or trying to focus on text (often in dreams you will read words or numbers, but it's your brain telling you what something says .. if you actually try and focus on text it often is just squiggles)
Once you start to apply these techniques in dreams, the real trick is not waking yourself up once you realize you're dreaming.
Some examples are not being able to turn a light on or off (because lighting in a dream is often fixed) .. or trying to focus on text (often in dreams you will read words or numbers, but it's your brain telling you what something says .. if you actually try and focus on text it often is just squiggles)
Once you start to apply these techniques in dreams, the real trick is not waking yourself up once you realize you're dreaming.