Mama, I would measure your room. How tall are the walls?
Order one to a foot less of that size and then you will need to take a small amout off the bottom and a small amount off the top so that the very top branch isn't so spindly and that it can take up plenty of water. Let it stand for 24 hours in a bucket of water before unwrapping it.
Place in a stand or pot of earth or what ever you are using and secure into place. Move the tree out away from the wall, unwrap and let the branches fall into place. Trim where necessary from the sides and the top then decorate and push intoits final place.
The needles are a lot softer than normal needles but the smell is just the same. As long as you keep it watered and away from the central heating it will be fine and wont drop a lot unless provoked.
It's expensive and with £10 delivery but at a date that suits you it is worth every penny. I love mine.