It's all about knowing you're dreaming whilst still in the dream. This is very possible and you need to believe that you CAN do this. Start by improving your dream recall by writing down your dreams in a Dream Journal. Read about the different techniques but the main one most people focus on in the begining is the DILD one. Go around and do Reality Checks a few times an hour and you're on your way!

Look forward to becoming lucid when you go to bed, set up a goal and you should have one soon enough.

If you have more questions, feel free to ask them here on in a PM.

Keep on dreaming!