World Edit Issue. MUST READ!

[PNWMan]

Whenever you have 2 points selected, the most recent selection point will have a number at the end. That number shows your selection size. Also LiteLoader+WorldEditCUI is super helpful because you can see your selection with gridlines. Also, there's //limit <amount> which will set a limit per user for the maximum amount of blocks changed. Keep in mind if your WE exceeds the limit, it doesn't completely drop the command. It just changes all the blocks until the limit is reached.