grats on your fist good one!

I was on the web and I found this
"You can pass through dream objects such as walls, glass, trees, and everything else. Confidence is really the key here. Some variations on going through stuff can be going in slowly, wiggling your finger in first, or running quickly into the object and telling yourself you would go through it. Some people particularly like to go through mirrors because of the unpredictable effects this action produces. However, if you tell yourself you will end up at a certain location before passing through a mirror, you can change the dream scene quickly. Be warned, some people experience nothing and wake up after passing through. You may want to hold your arm to keep yourself in the dream."

Lucid Dreaming/Using - Wikibooks, open books for an open world