I actually don't know that much about saddle fitting and what a shame. There is so much around biomechanics of both horses and humans that a well fit saddle can save hundreds of hours in resistance, injury and training, not to mention lots of saved money from vet bills, chiropracters, multiple saddle purchases and most of all-saved aggrivation.
I have been looking for a dressage saddle for several months and sitting in every one I could try for over a year. Today, I sat in one that was comfortable. It was the first time I ever sat in a saddle and went 'YES!'. It was like the first time I put on a pair of Dansko clogs, I just felt it was made for me.
Well, this saddle, a Schlesse, wasn't made for me, but it was made for women. After researching them tonight, I found they have published an excellent series on YouTube for the 9 points of saddle fitting. It is well worth 30 minutes of your time. If you have another 10 minutes watch the saddle fitting for women videos. In fact, if you are a woman, watch those first. They are ENLIGHTENING, I think I just came out of the saddle dark ages.
And don't freak out when you see the prices. Yes, they are expensive, but you can find used ones (that is what I am trying). And really, if it is the last saddle you ever buy-it might be worth the investment.
To find them on youtube, click here.