New to locating ... always had my buddy locate valves and wires if I needed it done. Last 4 yrs I hadnt need it to much. I'm more and more needing to find buried boxes etc... broken wires... so I've creep on here a bit about locators and determined a pro 800 was prob the best and most cost efficient I could use right now.... I actually picked one up for $450! That being said what or where should I start with this guy on leaning to trace wires and find valves?