Do you actually need a lesson in how to decorate your Christmas Tree? You would be surprised how many people fail to observe these essential rules.
Fig 1: First choose your tree. If buying after 20th December you will have to choose between fig 1a and 1c. (nb: if you still haven't bought one, check that date and worry).
Fig 2: Install in pot/holder. If this makes the tree too tall for your room, try one of these solutions.
Fig 3: Check lights. Put them on the tree first.
Fig 4: Unpack and untangle the treasured decorations you stored away so carefully last year.
Fig 5: Apply fake snow to tree until spray nozzle blocks (anything between 3-10 seconds). Immerse nozzle in water; prick with safety pin; repeat. Eventually attempt to make your own fake snow from shaving foam.
Fig 6: Admire your Tree. Anything missing? Attempt to fix star/angel/fairy/whatever to the top of the tree. You should have done this first. If you knock the whole thing flying, return to Fig 2.