Dell Inspiron 15-3567 How to get inside

How do open this up ? I'm used to to getting inside desktop machines, not laptops.. But need to replace failing 1TB spinning HDD with SSD i'm gonna order.

Following this article: Dell Inspiron 15-3567 Fan Replacement - iFixit Repair Guide

Do you really need to remove optical drive ? as it looks like the screws in the image are just holding the metal tray itself, not securing the bottom case at all.

In any case i cannot get access to this part,.. I removed the battery, but them i don't know what to do in order to popup the optical drive, (if needed)

Removed the 8 screws from the bottom casing + screw relating to optical drive in the middle., and i'm guess all i need to really to is remove the screws underneath keyboard. but the only snag is optical drive,, can this be left alone?