Sometimes? lol Try regularly!Rainbow Spirit said: "No one is the perfect cacher, everyone gets some DNFs, even the most experienced fail sometimes!"
I have developed a little saying - "SYFASYD" - Some You Find And Some You Don't!
Experience helps but every one I speak to agrees that sometimes you walk straight up to a cache, and the next person can't find it, and vice versa. It actually wouldn't be quite as much fun if you found them all straight away - the hunt adds to the challenge and the satisfaction of finding.
My find rate on a second search must be about 90% - "How did I miss that!" Although one cache did take me FIVE goes! (Geometry by maccamob)