It's been a very long time since I had to do that. I would draw the courses over & over in a sketch pad and then practice it myself on foot in the closest open area, most of the time with my eyes closed.
Now with technology, for my students we snap a pic of any posted patterns, be it showmanship, horsemanship or jump courses with my phone and go over them that way.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.