Daylilies are easy to hybridize.
The flowers are huge and the pistil and stamens are easy to distinguish. Pick a stamen from the 'pollen parent' with yellow and fluffy pollen on it and wipe some pollen on the juicy end of the pistol of the 'pod parent'. All that remains is to write a label in indelible marker and loop it gently over the base of the bud. If the cross works, the base of the flower will swell up and become a seed pod. The seeds will be ripe when the pod starts to open up by itself in about 6 weeks.