The best thing to do is make sure you have your GPS unit WAAS turned on; with that feature activated, you can get within a few feet of the cache (I'm assuming you have a WAAS enabled GPS unit and are in North America). When you get to the cache site, look for things out of place, piles of leaves just don't fit the location, stacks of sticks and branches, an area that looks like other people have walked on, etc. You'll soon develop a knack for seeing these things, and it will get easier and easier. Good luck, and welcome to the sport!