The likes of that might be on Ancestry.
I cannot seem to find out how to do a free trial, as it always makes me input credit card details when I do not want to pay, only try it out.
You need to register a credit card for the free trial. They won't use it unless you fail to cancel before the end of the free trial. It is a normal process, and I haven't heard of anyone being cheated. I think you can buy credit on a card if you don't have a real credit card.
Your local library may well give you limited (maybe an hour a day) free access. Mine does.
Martin