Do you ever get mixed-up when you assess how you are related to your various generation level ancestors? Or when assessing results of DNA percentages for relationship to cousins, or various possible match cousins listed at Ancestry DNA, Family Search DNA results? Your not alone many of us can still be confused when explaining cousin-level relations.
Here is a link to an article that you can use from Genealogy.com that helps to explain 1st cousin once removed and many other relation levels for Self. I find it useful.