Here is the link to the AHS database with info in their FAQ section on how to prepare your daylilies and how exactly to plant them for best growth.including how many hours of sunlight for optimum growth https://daylilies.org/daylilies/faq/

In regards to your question about cutting back the leaves, In the normal course of planting and then growing any leaves presently on the plants will die back as new ones grow from the crown , so yes you can cut back the yellowing leaves. It will not hurt the plant

Here is another link with instructions for you https://www.amadorflowerfarm.com/about/all-about-daylilies/daylily-planting-instructions/

Trem leaves, plant full sun, well drained area so they don't rot and forget about them and they should be fine. I use to plant a lot for new homes because they thrive on neglect. Also the young buds and flowers on most is eatable.

I concur with Glenn. I have a bed of 42 specialty daylilies and an area about 20x10 where I planted the standard orange wild ones that I brought from home. All are the easiest, hardiest plants I grow.

probably the most important thing is to make sure that the crown of the plant is not planted too deeply If it is it will affect amount of bloom and plant in full sun if possible although some daylilies will perform ok in a little less sun. . Top of crown of plant should be no lower than an inch from the top of the soil. Here are a couple of images of some of my daylily gardens . Good luck with your daylilies . You will enjoy them !

Signet, those are lovely! I don't have a lot of full sun around here, but I'm extending the sunniest areas I have to accomodate my dayliles and amaryllis this year, since I have some nice amaryllis bulbs that have never bloomed in the three years I've had them, and they're of blooming size.

I put all three roots in a 3-gallon container for now so I can baby them a bit. I figure they have to be tissue cultured, because I found one little clump that looked like a clump of seedlings, but that's o.k. I like surprises. I grew some amaryllis from seed and one bloomed last year. The seeds were from a red/white striped flower but the flower turned out to be a triple light red with white stripes. Very pretty!