We usually do it a week to week 1/2 before Christmas. For years, we would buy a live tree, with a root ball, to plant on our land after Christmas. My Man would dig a hole, before the ground got too hard and then cover it. Then we'd go and buy a small, table size tree with a root ball about a week before Christmas. Then it would settle in the garage for a day or two, and then the basement (you have to acclimate a tree which will go back out) and then finally into a zinc container (decorated by me and my once prodigious stenciling) root ball and all a few days before the Day!
A few days later, it would have to be un-decorated, and re-acclimated to the outdoors, all while keeping it wet enough to stay alive the entire time in the house and the process.
Then, on a semi nice day (cloudy is best) he would take the tree, now acclimated back to the cold weather and plant it, using the dirt he had taken out of the hole.
It was a big thing for us. We were going to have to sell our house to a developer, so we stopped doing this, as everything was going to be bulldozed and it seemed a waste of time, trees and money. (Live trees with the roots are very expensive.) When the economy went South, the deal with the developer fell through, so we had all these trees, and no more desire to continue using root ball trees again. (They are heavy, and My Man needs at least one or two other big men to bring them in and out of the house. Many injured backs were sprung by our Christmas trees.
So, then we started using the trees we had planted over the last decade plus, cut then down and take them in the house as regular cut Christmas trees. My Man and the kids just go out into the land, choose a tree, cut it down, acclimate it and bring it in for Christmas.
We got in the habit of only having the tree in the house for a short period of time. You don't get tired of it. It's a big deal for everybody, there is less dropped needles, and because we planted the trees ourselves and many of them were on their second
use as a Christmas tree, it is really nice.
We have our own little Christmas tree farm. Some are TOO large to bring indoors. But, we often find a good one among the tress we have planted in the past.
I don't like the decorations up too long.