Always check your state laws. In CA no notary is needed - just 2 witnesses, not named in the will as beneficiaries. Also, you'll want to learn how YOUR state defines the order of estate inheritance. This was especially true in our case, outlined below.
There's an old adage that says, "Never say you know someone until you have split an estate with them."
Boy, was that true! Sticky situation and hurt feelings the first time I settled what was a SIMPLE estate - no RE, 1 car to sell, an apt to clean out, 2 heirs 50-50.
Conversely, my FIL's estate was simple: everything was in an RLT and went to MIL, and my spouse would eventually inherit anything left. Despite this, we still ended up misunderstanding something the lawyer told us. We were just lucky the IRS never came after us.
We are childless and our estate wasn't large. But we weren't leaving it to the most obvious heirs - everyone blood-related to us is employed in good jobs and doing well. We wanted to leave our estate to a member of our extended family who really is going to need help someday.
When we went to a lawyer to set up our RLT, we learned that because this heir is not blood-related to either of us, the document had to be specifically worded because we were disinheriting other people who could normally claim to be in the order of CA's estate inheritance.
Also, be aware one of the major differences between a will and a trust is that an executor is paid for time and expenses from the estate, before disbursement.
A trustee, OTOH, is paid for estate expenses but NOT for time. This is a major oversight for a middle-class estate in trust; even without inheritance disagreements it can take considerable work to settle an estate. All of which, of course, has to take place on weekdays between normal business hours, which is very inconvenient for working people!
Our trust, should a successor trustee be necessary beyond my spouse and I, specifies the trustee is to be paid current professional trustee rates for their time, in addition to the expenses.
We were advised that if listing more than one heir in will or trust, it's considered safer to obtain a release from ALL possible beneficiaries, if you make any future changes. For a trust, in fact, it's mandatory in our state. It helps forestall any legal challenges of the sort that claim "so and so unduly influenced our poor old relative to grab some $$$$$".