We've brought home to 8.5 week old kittens today, adopted from a farm. They are happy to explore and are playing with each other, but do not like us to come too close. There seems to be mixed advice, though, on whether you should start handling them right away. They had some of this in their old place, but maybe not too much. Do we leave it for now or try? If we wait, how long should we give it?