Is there a guide on installing custom and downloaded icons?

[ARF900]

So im looking to start customizing my mac. Starting with changing the default icons. Are there any guides on installing the custom icons that you download?

Is there also a guide for applying different docks? Thanks.

 

[stridemat]

This guide gives a very broad overview of what can be done and how.

 

[MacDawg]

This guide gives a very broad overview of what can be done and how.

I was going to link to the same thing
Nice guide to more than just icons