I would say, keep watching for dreamsigns all day. And not just for the
one's you have picked out. Watch for any kind of abnormalities, in what you are doing,
or where you are. This works very well for me!

If you do this a lot, you may not even need to notice a dreamsign to
become Lucid. You could just suddenly know you are dreaming, for
no reason! It happens to me all the time.

It may take awhile, depending on the person, but it will happen.
And if you keep at it, it will happen a lot.

Good luck