Maybe find someone who can show you what the steps are. They could also watch you so you don't have to keep looking at your horse.
I do Clinton Anderson things, but they seem very similar. I started by reading a book with lots of pictures.... then I bought the handy stick and followed the book on how to desensitize/sensitize Citrus to it..... Practice getting your energy up and then relaxing, even in the car- it is hard to do when you have not practiced.
I started by getting him to move each end away... you really have to practice the four levels of cueing and not be afraid to get after your horse if it does not pay attention to the first cues. Also, remember to release the pressure instantly when the horse does what you want it to.... it is the release and rest that train your horse :)
Have fun- I am really enjoying a new way to work with a horse and watching my daughter do it too- it gives her confidence with her big guy.
Is there someone in your area who is experienced with Parelli?
I think, no matter what style training you are going to undertake it is best to have a good trainer/mentor that you can physically meet with and learn from.
DVDs and such are great but a real person is better, use the DVDs as a bonus on top of the real person.
I agree with Alwaysbehind there are plenty of PPs in America I only have 2 1 star instructors here in Ireland and neither of them are in my area :( so good luck
Try getting your hands on one of his books--they are a bit out-dated, but it is a lot cheaper than buying his level kits and DVD's. Once you decide whether or not natural horsemanship is something you want to actively pursue, then go ahead and buy the more expensive things. :)