Renee, I don't have a lot of experience (got my first chicks last summer) but what I have observed is that they really DO learn by example. When I got new, horizontal nipples for their water, they didn't know what the heck to do with them until one of them started pecking at a nipple, got some water and got excited...within a few minutes, they were all (16!) pushing each other out of the way to get a drink!
Same thing with the bucket feeder...they kept looking at it in wonder until one brave girl stuck her head in there and found the crumbles...all of a sudden, there was a crowd!
When my girls started laying, I would see one or two in a nest, and several others watching around, "talking" to each other about it...and now, they're all using the boxes.
I think that as they see the first girls laying in the nest box where you want them to, they'll all catch on.
Some recommendations I was given (which is a bit late for you, but maybe the next newbie reading this will benefit):
1. Get the nesting area ready for them before they're actually ready to lay, but block it off in some way so they can't get in there. Pricks their curiosity a bit, and allows them to get comfortable with the "new addition" before they start to lay...I think if the nest boxes are too "new" to them, they might not be comfortable with getting in there. Then, when you're pretty sure they're "on the brink", open up the area so they can get in there and check it out.
2. They prefer to nest in darker areas, so that's why curtains may help, or fronts on the boxes to close them in somewhat.
3. Keep the height a bit on the short side. Supposedly, this helps curtail them from pooping in the boxes. IDK if it's true, but so far, I haven't had any poopers!
4. If they have to hop up to get into the box, definitely put a roost or landing area in front so they can land, and then step in. Also, since my girls seem to "line up" to use the same boxes, this would allow one to check to see if the box is occupied before jumping on in there.
I have 5 boxes for my 15 hens (one of the 16 is a rooster) and they seem to use the ones on either end and the one in the middle. (kind of like the chairs in the doctor's waiting room...no one seems to want to be too close to their neighbor!)
Hope this helps someone!