Some good tips in here. I too am new and I've had two attempts at a cache in a park 400 meters from my home where I have not been able to find it. On the first attempt, I thought I'd found the spot for sure. Found some rocks all piled up pyramid like. I unpiled the rocks and found the skeleton of somebody's pet cat buried under the rocks. Had my 11 year old daughter with me who was horrified at the discovery. Fortunately she's not scarred for life and is eager to do this with me. LOL
So, this is the only one I have looked for, going back tomorrow with my new GPS just purchased today for another look. I think I may be putting a little too much faith in my GPS to get me to the exact spot. I will expand my search area once the GPS gets me to the zone when I go back for another look.