Reading this thread makes me feel overly organized.
I start my list of ideas in about August.
Start buying in September and tick off and adjust list accordingly. 2 DC who both have same number of presents (not same amount of £ spent).
Stockings come from Father Christmas. Presents under tree are from family.
I wrap in brown paper with different colour ribbon depending on the person, and put under tree from mid December (I love seeing a tree with presents under it).
We don't buy huge amounts of presents and Ive always made sure we have enough places to hide them, wrapped or not. It really helps that my DC don't go looking for presents.
Usually I wrap over several days in December when DH takes DC to the park. For the first time this year I actually started wrapping in October.
I don't forget what Ive got cos its all on a list.
The only thing we've ever had to build was a kitchen - that was the least enjoyable Christmas eve ever.
Of course every family is different. I have 2 very bad sleepers and I am not taking the risk of them waking by wrapping when they're in bed.