you can directly paste all icons in the pprogram files where you will find the folder of Mac Dock and in that there will be a folder for all icons to be kept just paste it there and on the dock just right click and in the properties select the icon you want to keep.
Hope this helps.
Yeah I just learned this after. I always learn by myself after I ask someone
I will probably search around for more icons to de-default my dock. You can be sure that some will be from you, I love seeing your icons!