Re: Adjusting action on acoustic guitar
Make sure the neck is straight first. Then yank out your saddle and run it across either a file or some course sandpaper. But if you're going to do all that work, why not change the saddle to something of better material (Bone or TUSQ). If you're going to work with your existing saddle, what I normally do before I start shaving the bottom of the saddle off is that I mark the sides of the saddle so I can see how far I've gone.
Needless to say, adjusting action on an acoustic is a pain compared to electrics.