Save only 1 male.
Put a paper bag over it when the flowers are about to open. Tape the bottom as close around the stem as you can.
When the pollen is shed, cut down the WHOLE male without removing the bag.
In another room, take the male out of the bag.
Now pick one branch of one female you want to pollinate.
Put the bag with the pollen on the inside over that 1 branch only- you'll get plenty of seeds, don't worry- for only about a day.
Remove it without letting any pollen get out if you can help it.
Tag the branch that was pollinated. You should see seeds starting to form in about a week and a half.