How do I add a custom script to a game object via its name as a string?

Hey all,

I'm trying to figure out how to add a script I made (In this instance, it's named "PickaxeTool") to a game object through the name of the script as a string. This is what I tried already and it didn't work; it prints null:

Code (CSharp):

1. System.Type t = System.Type.GetType(typeString);
2. print(t);
3. itemInstanceObj.AddComponent(t);

I've read some things online talking about how you need to specify the Assembly its getting the script from, but I don't really follow what that means. Any help is greatly appreciated.

Cheers.