I want to upload some of my translated manga on a reader I have control over, so do you guys know of any good script for this?

Did you look up to GitHub?

I'm slowly sorting through them, but I have no way of knowing how stable and safe those scripts are, I hope to get lucky and get a recommendation from someone that already uses one and knows it's good.

What about watching this tutorial?

I also need to install this script on a shared webhost with cPanel and no terminal access, which excluded almost all scripts from GitHub (so much Laravel), just one seems easier, I managed to install it and I'm testing it right now, WireManga.

Good luck, then!