Do not cut it off.
A tail takes years to grow and only hours(If dire) to clean up.
Try to combing it out* starting at the end, when you give up for the day, braid what you have cleaned up andtie the end up with yarn or a rubber band for when you get the courage to tackle it again.
Or call a braider. Yes they will charge, but what is your time worth?
*Cowboy magic crowd but Showsheen is also good as long as you rinse it out after the combing as it has been rumored to make hair brittle if left in.