You can lower the bridge using a small Allen Wrench key that you got with your guitar. American strats don't use standardized Allen Wrench so be careful not to loose yout copy. If you do loose it don't try it with a regular size allen wrench - you can damage the bridge saddle screw. Instead go to nearest Fender distributor and buy this wrench.
OK if you do got the small allen wrench key, carefully screw down the bridge saddle screw. This way bridge saddle will go down (closer to the body). Do this in small step increments. when you start noticing the string buzz this is a far as you can go. If you wanna go lower, you have to see a guitar tech to give you a proper setup.
I have never seen the magic wand that guitar techs have, that enables them to do magical things that I cannot do, turning no more than 2 sets of adjustment screws, and a truss rod.
It is simple, and logical, anyone with a brain can set up their guitar better than the guy in the guitar shop. Except maybe to cut the nut, you need special tools for that, which I have. You won't break your truss rod if you just use common sense. The rest is just setting the action and then the string length. There is simply no more to it. You can read on internet.
If they are going to work on your frets, fine, but I don't think we are talking about that. Sorry to be a pain, but there just is nothing magically hard about setting up a guitar that an 8 year old can't do.