Depending on what guitar usually that isn't horrible complicated. You just sand down the the saddle (one luthier suggested sanding the nut too on a certain guitar I had so you may need both). If you're the DIY type here is a link
How to lower the action on acoustic guitar explained easy | Stuart Briggs
If you're not, the guys above are correct. Take it to a professional and let him handle it or you could replace the guitar if you don't think it's worth the cost. String squeak is usually just technique, and it sounds like right now the guitar is difficult to play so your technique is sloppy.
For the record though it depends on the player, some people love the squeak, some hate it. All personal preference (like everything in the recording world). Hope that helps