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I do not know how to explain this, but that is what ROM hacking is. You must know how to use Advancemap, a script editor/creator of your choice (most people use XSE), Unlz gba, ect. This list of tools could go on forever. You also need IMAGINATION
Use a tool called SMCA. It can be found in...
I usually switch tasks when I am bored.
For example: When I am bored of mapping/scripting, I work on overworld sprites. Then when I am bored of that, I switch to title screen editing.
Switching tasks can help.