Writing your own memory book
When it comes to writing your own memory book, you write about what you know first, then fill in the gaps. It sounds straight forward, and it really is as long as you follow a few trusted rulls.
When it comes to what you are thinking, or what you thought, about something that happened, then you are the only one who really knows the truth. But when it comes to what physically happened, then there are usualy several points of view.
So describe your thoughts all you like, they're your thoughts and nobody else had them.