I made this wreath last weekend. From picking up the leaves off the ground to hanging it on the door was under an hour (well, excluding the time spent getting all new leaves because I decided on a different tree). I tore some random fabric into long ~2" strips and secured it into a straw wreath form with pins. Then I wrapped it tucking in the stems and a bit of the leaves and continuing around. It was all easy except the last bit where I had to tuck into existing leaves. You can totally tell where I started/ended.
A week letter it's on the door and a bit crispier and fluffier but still pretty. If you still have leaves you could still make this for Thanksgiving.