Thing is, new people don't. I have to remember that not everyone knows how to use it. They have a tutorial for IPS, but not for UPS.
When I remove data, I simply convert a couple hundred bytes to 0x00 or 0xFF just to see how the game will react. This way, I learned how to tell what many kinds of data are just by looking. Funny thing is, I use a Tile Editor for hex editing, but they are practically the same (each number is shown with a different colour on a 16 colour palate). It's actually much easier to read pointers this way.
Also... I went in to image hack Pokemon Pinball R/S, and practically EVERYTHING is uncompressed o.o