[Q] Can't change my boot animation topic

Hello! I've been trying for a very, very long time to change my boot animation. I've tried a lot of stuff, and none of it works. I've tried changing the bootanimation.zip, hTC_one_boot_up.zip, I've tried flashing a bootanimation.zip, nothing works. Can someone walk me through some steps to take to change it, and then listen to me to see if it works or not? I'd appreciate it.

Please bear in mind, although I've rooted it and all that jazz, I have a very rudimentary knowledge of my phone. So be careful about terms and such, as I might not understand everything.

Thanks in advance!