How do you lower action on an acoustic? Is it even possible?
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Sure it's possible. Can you do it yourself is the big question here. If your comfortable using sandpaper, tape, and a fine gauge ruler, then you should be able to do the job yourself. It's rather tedious though because you have to do it little by little, and restring to test your progress. In essence, what you do is first off, have a brand new set of strings handy. Remove all old strings. Remove the bridge saddle piece next. That's the white bit that the strings actually rest on in the bridge. Tape a piece of 125 or 250 grit sandpaper onto a very flat surface. Kitchen table would work good. Be sure to use that blue painters masking tape so you don't mess the finish up on the table if it's really nice.
What you'll do is sand the BOTTOM side of the saddle EVENLY so that you remove the same amount along it's entire length. You don't want to change the angle either, so hold it true and just slide the saddle back and forth a few times.
Check the slot in the bridge for debris, then slip the saddle back in and re-string. Tune up and check your action. It won't take much to lower the action. What you do not want to do is go too low too fast. You'll wind up with fret buzz if you sand too much off.
If you want to lower the action at the 12th fret by 1/64th of an inch, then you would need to remove 1/32nd of an inch from the bottom of the saddle. It's double.
If you try the saddle and find that you can still go lower, don't take the strings off the tuning pegs, just give them a lot of slack, then pull the bridge pins and take the strings out. If you give them enough slack, you might be able to slip the saddle out without having to remove the strings at all. It can be done, just a little tricky is all.
Hope this helps out.
^By the bottom, you're referring to what would normally be inside the guitar, correct? The side that would normally be facing the guitar's interior?

Thanks, BTW - I may have to try that.
^ Bottom, as in opposite the side that the strings rest on. Also, as an afterthought, and this is for everyone who may read this and attempt it. Make sure that you indeed need to lower the action prior to attempting it. Many acoustics, quality ones anyway, don't need an action adjustment because they are very decent from the factory. Cheaper guitars are another story, but let's not go there.
An acoustic is more difficult to play than an electric due to the heavier gauge strings. But the acoustic needs those heavier strings to get the soundboard reverbrating. That's where all the sound is in an acoustic after all. Electrics can get away with lighter strings due to the pickups doing most of the sound transmission. If your of a mind to adjust the action of an acoustic so that it more resembles an electric, you might find it a lot more difficult and not worth the effort. Each has their strong and weak points. Just a few words of caution here is all.