plastic bags over the cups, yer often done it that way just to germinate the seeds
this is what i do
drop the seeds in a glass of water and leave somewhere warm 20-25c for 12-18 hours
mix the water with your finger and check they drop to the bottom of the glass
put the seeds in the soil and give the pots a little water, so the top 50% of the pots are wet
put it somewhere dark and warm, bag over the top of the pots or in a propagator or anywhere to keep the humidity high
as soon as the seeds germinate, get the humidty to drop, remove bag, open vents on the propagator ect
low humidity or dry soil will kill the seeds before they germinate, some growers leave the seeds in wet paper in a plastic bag till the seed germinates and the roots 1" long