Blue Pacific Parrotlet laid eggs!

Saw them mating for one whole week early this month and ever since then, the female have been hiding in her nest box. While the she is out for food early this evening, I took a peep into the nest box and saw 4 eggs! Hope that this clutch of eggs will be fertile. Anyone have any exp in breeding parrotlets? Heard that they are quite difficult to breed, is it true? Any special care/attendtion that I should take note of?