It's harder, but plausible.While the plant is small and untill it fills the pot, You still have to be carefull not to overwater. If you mix the coco with perlite, it helps a lot to prevent overwatering
It depends. The medium has to have enough drainage to supply plenty of oxygen to the roots. Otherwise, overwatering is still possible. If it's really humid, your plants will perspire less and drink less too, possibly leaving your medium even wetter than normal.