Join Date: Apr 2008
Location: Orange County, NC
Patience, praise, time, and lots of riding and/or lots of practice with the things that spook him.
For the stones hitting barrels or poles, start by putting him on a lead and tossing stones to make the noise.
For the lines, walk him back and forth over the lines. BTW, this is not unusual...some horses are very careful about where they put their feet, and often want to take a very close look at lines, ditches, etc. before stepping on/over them.
Praise every bit of progress, don't get frustrated, and remember you're asking your horse to overcome a very strong flee instinct.
Finally, if you can do any of this along with a very seasoned horse that doesn't spook, your horse will watch and learn even faster.
On the sixth day, God created the Quarter Horse.
On the seventh day, he Painted the good ones.