I'm new to geocaching, but after finding 4 caches, I've gotten the hang of it.
1. I'm not sure exactly what you're asking, sorry.
2. Try to remain nonchalant when searching for a cache. I usually try to look for a cache when there is a lower amount of muggles in the area. For example, I recently found a cache in an area where there are usually many muggles.However, I searched for the cache when there was a lower amount of muggles in the area. You just have to wait until you feel like there are few muggles so you can search for the cache.
3. No, GPS should help you.
4. See #2