Please, please, please get tongs. Never use tweezers and surely NEVER use anything with the word "needle" in it. Literally hand feeding them with your bare hand is not recommended either. Hand feeding in my book is using tongs.

And it's definitely possible that they become more sociable. However, it seems more times than not it won't happen. I have frogs that are truly not one bit scared of me and are very sociable.

On the other hand I have frogs I've had for years that are still frightened. It all depends on the frog I guess. As I do nothing to scare them (besides being much bigger than them), ever.