Handwritten wills i.e., holographic wills are valid in Hong Kong and in most jurisdictions around the world. Perhaps the most famous holographic will was that of Napoleon Bonaparte, who seemingly had plenty of time on his hands while exiled on the island of St Helena in 1821. He wrote a whopping five long pages and numerous codicils by hand, which was the requirement under French law for a valid will, in the absence of a notary. After praising his loved ones and lashing out at each of his political enemies, he bequeathed to over 7,500 beneficiaries the contents of his entire estate, down to a pair of slippers. The beneficiaries were not only his immediate family members but everyone from his General Montholon (2 million francs) to regular soldiers (100 francs each) in his army. It took the executors of his will 40 years to complete their tasks.
Handwriting your own will is likely to be easier than the task that Napoleon undertook, but here are some of the more common (but not all of the) pitfalls to avoid: