I’m not going to kid anyone, I started packing about a month ago! Why not? All the clothes I want for Orlando aren’t going to be worn in the Winter in the UK; shorts, t-shirts, sandals etc. But packing over a month in advance does also mean re-packing a few times (maybe 4 or 5 times for me). However it also means you’ll know what things you have forgotten by the third re-pack as well as things you need to go out and buy such as suncream, shaving gel, etc.
You’ll never be finished packing until the morning you leave for the plane but you can be as close as possible!