If I open my Macbook Pro's bottom cover, will it void my warranty?

no, apple allows users to open the bottom case to upgrade ram and hard drive. Instructions on how to open it and replace the ram are even included in the owners manual.

Willychan wrote:

I want to open the bottom case, will it void my waranty?

No, only if you damage something on the inside or do replacement or repair outside of RAM and hard drive.

https://support.apple.com/manuals/%23macbookpro

Get a good #00 Phillips driver, which has a handle where the end spins. It makes a difference.

Ciao.