Since 2018 the amount of Will dispute cases has risen, due in a big part to the rise of DIY Wills.  Whilst some would argue that it's better to have "some kind of Will" than none at all, the continuing high profile legal case over Aretha Franklin's Will in the USA shows the problems that DIY Wills, and indeed the storage of the same, bring to estate administration. 

It's always best to get a professional to draft such an important document, more especially in these times of non-traditional family units, second marriages, stepfamilies etc.  They can give the necessary advice, and can be a useful impartial executor, particularly where family discourse arises.