Since you are totally new to this Sport, you must concentrate on developing an understanding of the sounds...This is an Audio Primary Sport, and as such, it takes a while for your brain to sync with what the dirt is saying. Similar to learning a musical instrument, you gotta put in the time to develop a keen well tuned ear...
So...You go out and concentrate on each and every tone and try to get an idea of what it is and how deep it is and what its profile signature is saying to YOUR BRAIN! Dont trust your eyes on the screen all the time, use them to look around at the surroundings for potential locations....Its all repetitive, the more tones you subject your brain to, the faster it will learn...
This brings up another important skill for Noobies to learn...EXCAVATION Ergonomics! Not every target needs the same amount of effort to exhume...some are no more than a few inches down in the grass roots and can be swiftly and easily popped out with a screwdriver..chip totter targets are exposed quickly with the kick of your foot...
You can condense your learning curve immensely if you get really good and FAST at target excavation...Meaning, in one outing, if you pull 200 targets instead of 50, you are gaining a HUGE experiential Brain immersion advantage!
So your ears are to evaluate the signals..Your eyes are to evaluate the sites, your excavation efforts must be smooth and fast and simple and above all comfortable...you may find you develop a unique digging style and specific tools that work for you...You may find you dont have to kneel down for each and every target...
Concentrate on dispersing the physical effort on your entire physical platform so you are not hurting in one place in particular, just an overall workout feeling...I myself do a wide legged stoop like a Giraffe taking a drink...its comfortable and fast and the weight of my upper body is utilized to provide what kind of digging power I need...
You will get it, we all went through this...after 10,000 targets or so, you will be a dirt virtuoso...then you can decide what or what not to dig, but for now, consider yourself in Dirt Band Camp and get a good foundation to build upon! How fast can you pop 10,000 targets? Well, lets just start with a rate of 20/hr for now...do this in 2hrs and come back with the 40 target junkshot...
Then the next time out, you set a rate of 40/hr, then 60, then before you know it, you will be amazed...Find the most target heavy trashy parks and get busy with your education...