How to properly disassemble screen cover in N550JV laptop

Hi, as title implies, I want to disassemble the lcd. Why? Because while trying to fix a noise I was hearing coming from the inside of the screen (which by the way I fixed), I broke almost all the small teeth of the hinge cap and 2 of the back lcd cover, and now I need to replace them because the inge cap won't clip on the cover. So, I have 2 questions, the first one is how do I disassemble the back cove,r the one you can see here, and the second is, how do I properly remove the hinge cap (which you can see here) next time I will need to, without breaking all the teeth that hold the cap on to the cover.

You can try with words, but, if you could upload photos, or even better videos, it would be super.

Thanks for helping.