Is there no sure way to safely catch a gecko?

well it depends on your definition of "safely." do you mean safe for the gecko, disease wise for you or the gecko, or are you concerned the gecko will bite you? if the gecko is wild, there is usually not a big chance for disease passing from the gecko to you, although you could pass a disease to the gecko, but it's unlikely...if your scared the gecko will bite you, well, it probably wont break the skin so there's really nothing to worry about there:)