If you stick with it, Miles, it gets better. Whether you stick with it or not is up to you.
I hunted approximately 30 hours before I dug my first obsolete coin, a wheat penny.
Now a hunt without any obsolete coins is unusual for me.
It's not a lot, but here's a little advice based mostly on what I've learned from others here and a little on what I've figured out myself:
While it may be true that no area is ever hunted out, many areas that have been hit hard by our kind have been seriously depleted. Remember that if an obvious public site looks good to you, it's also looked good to every other dirt fisher for the last 40+ years. That means that most good stuff that's left is either going to be deep, masked or both.
Practice pinpointing! The F5 with the standard 5X10 coil is a spot on pinpointing machine. Tape coins a few inches apart on the back of a piece of thin cardboard that you can't see through. Put the cardboard over a metal-free area. Swing your detector at various heights over the cardboard and pinpoint. When you think you're directly over the coin poke through the cardboard with a knife or something sharp and try to hit it.
Make sure the blade of your digger is sharp and cut a three sided "flap" plug when you retrieve leaving the grass and roots connected on one side. That way if you do it correctly and the ground isn't too dry, the grass won't die although you will sometimes get temporary brown spots depending on the moisture level in the ground. Don't detect a manicured lawn or anywhere with growth you care about during the dog days of summer or any time the ground is exceptionally dry. Any extra dirt you remove put on something that you can easily dump back in the hole. Some use a towel or cloth. I use a frisbee. When I put any dirt back in the hole and push the flap plug back down, I give the plug a few quick hard jabs around the cut area to seal it well before I stand up and stomp it with my foot. Unless I get stupid and sloppy, you can't tell where I dug when I'm done.
Wear gloves, a nail or piece of glass through your finger definitely takes away from the enjoyment! Another excellent more advanced retrieval method on coins that aren't too deep is called coin popping. Being excellent at pinpointing is very important when you use that method. Use a good pinpointer like the Garrett Pro-Pointer so you don't have to keep swinging your detector over the hole and don't get confused as to whether the target is in the flap plug or still in the hole. It's not the only good pinpointer, but it's become the most popular with successful dirt fishers.
Detecting in a remote area where no one cares, or better yet in your own yard, is the best way to learn and perfect your retrieval technique when you're starting out.
You'll often hear people say you have to dig a lot of trash to find treasure. That's true, because almost all gold hits in the trash range. But when you're first starting out (or any time you're lazy) there's nothing wrong turning up your discrimination and cherry picking the silver, clad and copper like Mike Hillis said. This hobby is supposed to be fun, and if you dig 100 straight pull tabs the fun level definitely goes down...
I often quote Bill Revis (AKA Uncle Willy who moderates the Garrett forum) who says the biggest mistake by far that he sees newbies make is turning the sensitivity too high. With the F5 that means the gain and threshold.
Good luck to you!