What Jason said about the hundreds of hours is the ONLY way to TRULY understand what's going on. Getting help and trying different things gleaned from forums is a big help but the real intelligence is gathered when you're out there with the machine. The machine itself is the greatest teacher,as you get to "hear it straight from the horses mouth",so to speak.
Because most of my desirable targets are near or with something else on many occasions,I always use the "wiggle back and forward" method to pinpoint a target. Using the actual pinpoint trigger can be confusing with multiple metallic objects around for sure. This also helps to "size" the target,for me it has to be a coin sized target.
As stated also,the numbers when sweeping in short (4-6") sweeps over the target usually produce the best repeatability and target ID in my experience. There is a perfect swing speed for each and every target,depending on depth of target,orientation,target makeup,surroundings,etc. EVERY targets situation is different,even if they are all silver dimes.
An elite hunter will spend many many many hours in search of what they're looking for. The CTX is the most amazing machine I've used,even though it's just been a few. Being able to find silver just about every hunt is a really good feeling,and gives one a high level of confidence that their machine is up to the task! It is also confirmation that YOU are a huge part of what makes the machine what it is.