The third eye is yes, as previously mentioned something you have to work on. However, there are multiple ways to open chakras.
You can use spells to assist, but, in the end, it amounts to your chakras and how open they are.
Commonly used is the very helpful guide here: http://www.eclecticenergies.com/chakras/open.php
The test also available from the site can show you what chakras you need to work on for stability. http://www.eclecticenergies.com/chakras/chakratest.php
Before you focus on your third eye. MAKE SURE YOUR BASE CHAKRAS ARE OPEN. Unstable chakras are bad for the soul. Keep yourself balanced and stable or you may be put at risk within you.