It not that hard tbh.
Just copy icon.library to libs: and then add a LoadModule or LoadResident declaration as first line in S-S to load the library.
I'd suggest to also use the Workbench.library 45.132 which also works for WB3.0 as it has many improvements from the stock one.
Also it's not only the speed and the ability to be able to SEE (and not the dot) EVERY icon available without having to install anything.
It also has the ability to remap colors being able to see even OS4.x and DualPNG icons in OCS systems (without RTG). On Snapshot... you get a popup windows asking if you want to convert the icon to 3.5 format in order to gain size and speed more!
It has embedded support for PNG decoding (which zlib.library done externally) and also it has RTG support for displaying FULLY OS4.x and DualPNG icons without the need of using AfAOS or PowerIcons patch. Everything is built inside the library!
Also there is support for grayscale color remapping and other stuff that I can't remember by heart.
Peter Keunecke's work is just unbelievable and a great asset for every Amiga that uses Workbench frequently.