Found a really great article today that breaks down each obstacle - what is required and how to practice at home. Check it out http://www.mirrorkbranch.com/article29.html
Here is another good one. http://www.ponybox.com/news_details.php?title=Horse-Training--The-Trail-Class&id=1373 Shows video of a much simpler trail class and talks about how a good trail horse should not be spooky and will take their time. Pictures of some great obstacles.
