Here is a straightforward look at this topic for Malachain.
A will is a short list of who should receive what, who should carry it out and who should look after any children. For most people with a home, some savings and a family, a straightforward will takes an hour with a solicitor or a reputable will-writing service and costs less than a weekend away. Without one, the law decides, and it often decides differently from what you would have chosen.
Sign it in front of two witnesses who are not beneficiaries, tell your executor where it is kept, and review it after every big change: a marriage, a child, a house move or a death in the family. Keeping a list of accounts and policies alongside it saves your family weeks of searching at the worst possible time.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.