The Public Trust Office will prepare a will at no charge BUT ...
... they charge substantial fees to the estate when you die.
Any lawyer can help you with a plain-English will for a modest fee.
Not free anymore I'm afraid
Not reliable either. My late husband and I used the Public Trust. I would NEVER recommend them to anyone. My husband was killed in a car crash and, in theory, the Public Trust was supposed to execute his will. They did nothing apart from send me a nice condolences card. Wrapping up his estate took time due to the need for an inquest. I was dealing with enough stuff through this time, including being broke due to jointly-held bank accounts and assets being frozen until after the coroner's findings. I didn't chase things. Eventually, the PT office made an appointment to "finalise" the estate. Nothing had been done. Not a thing. No advertising for creditors, no contacting beneficiaries, no claiming insurances, nada. No probate either. They made such a mess that they decided to hand me a copy of the will and tell me there was no charge.
Whatever you do, use someone you can trust. Or someone your heirs can successfully sue.