At 40 feet, it's time to put down the GPSr and start a visual search. No, you don't stink, you are just new.
Perhaps you could find a nearby easier cache to get the feel of using the GPSr?
Post your location (sorta, closely, not your address) and I'm sure some more experienced on here could point out an easy find?
What I do is stand on the trail and look in the direction the GPS is telling me to go. I judge the distance and say " near that tree over there" Then I stay on the trail and move a little farther down the trail about 10 feet and look where the GPS is sending me. If it looks like the same place I head to that place without looking at the GPS.
When I get there I take another look at my GPS. Sometimes I have to stand in the same spot for a little while for the GPS to catch up to me. Then move again so it knows which direction I am headed. If I'm not right on top of the cache then I repeat the look and move technique.
For most caches you stay on the trail until right near the end.
Make sure someone has found the caches you are looking for recently at least then you are sure that they were there on that day.