When I first started with Poser I used to install and unzip packages right into the Poser 5 runtime folder.  Then I would be in tears because I couldn't find anything.  An installed item didn't have naming continuity throughout the runtime.  The person may have named the folder in Characters one thing, then named the folders in Poses and Props something else.  Nothing fit together.

Once I learned that I could rename the folders inside the main library folders, I started to install / unzip packages to a separate folder on my desktop. Then I would go browse that folder and name all of the newly deposited folders the same thing (except for morph folders). So in the case of a cave made by Bob, all of the folders for that would be reanmed "Bob - Glittering Cave".  In the case of Daz items I put the catalogue number followed by the name of the item IE:  "ps_ab1234c  - Noble Red Dress"

By doing this I know that when I go folder to folder in the library, that I can see at a glance if there is something in there that is part of an outfit  that I am using.

I also found that it helps to have external runtime folders.  I have 42 I think. I have a runtime for each theme such as Christmas, Halloween, Props, Poses, Lighting, Hair, Mermaids, Angels/Faeries (both have wings), Vehicles.  And when it comes to figures other than Aiko and Mil Kids, I have 2 folders, one for  the figure's character addons and another for their clothing IE: "V3 Character Addons" and "V3 Clothing"

I know exactly what I have in each runtime and I know exactly where to find it. Plus it makes backing up and saving the runtimes much easier because instead of one runtime that is multiple gigs large, I have a number of smaller ones, some of which are still multiple gigs large, but they are still smaller than what it would be if all of them were together in one.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi