Hi William:
Welcome to the forum and thank you for your question. One of the big challenges with S/A is that it's deceptively simple.
Write out something that you think is true, and then ask if it is true... really true. I could start with my simple experience in this moment.
I am sitting in a restaurant at the moment waiting for my lunch to be served. Is that true... is there a me? Well... I need to look closer at that.
So, in that simple observation is enough for one to contemplate for days, weeks, months... it's really all you need.
Of course it will get boring, that's just your mind defending itself. Eventually you will think you are going crazy when you are actually going sane.
Simple but not easy... otherwise many would have go it by now.
Love ya, Jed.