Gani Mirror?
 

Is it possible to mirror things from left to right in the Gani editor without having to redo it all? It's really a pain finishing left, down, up and then having to try and make the right identical to the left. Or maybe theres some trick with using X and Y values or something to just help me out x_x

No.

The reason why this can't be done is cause the sprites are different, it isn't a single object.

Open it in word pad and copy and paste everything changing the file-name and x,y respectively tends to be faster. Sometimes doing it manually may look better though

Best way to create a gani is to do every side in a frame before moving on.

I disagree there bl0nkt ;o You'd try to make each frame look identical and sometimes that isn't possible with the given sprites and can complicate things... it also sucks to reach so far and realise something can't be done in a certain direction and you have to do ALL directions over x_x It's better to have a finished product in one direction and compensate in the other directions after in my opinion.

I used to do that all the time. Got very frustrated with it.