I've got a totally noob problem!

I got the aluminum rear hub as a hop up. However, I am having difficulty disassembling the stock hubs from the dog bones, pins etc. Could anyone give me some guidance on this? I would like to use the parts from the stock hubs and transfer them to the aluminum ones - I am new to the hobby and I have been following the manual but it's still not clear to me.

Thanks in advance!