I am lucky. I live in the land of saddle fitters. I have many choices of who to use and don’t have to wait months for one to travel to my neck of the woods. My fitter comes to my barn at least twice a year to evaluate how well my saddles fit. Even better, I have access to independent fitters — people who are not repping a particular brand so they are not trying to sell me a better, more expensive saddle than I already own.
However, many people live in a saddle fitting wasteland. Perhaps the only people they can get to look at their horses is a rep for a brand. Maybe they aren’t even that lucky! Those people have two options: learn to fit saddles themselves or work long distance. Given how many people I come across who have ill-fitting saddles (even when they think the saddle fits), choice #2 is a pretty good option.
To work effectively with a saddle fitter you need to be able to provide two things: a good set of photos and a wither/back tracing. You can follow the link to video instructions on how to do a wither tracing. And Kitt Hazelton (Panther Run Saddlery) wrote a great blog post that shows exactly what kinds of photos you need to provide but they include conformation shots, a conformation shot with the saddle girthed up, and a view that shows the tree points in relation to your horse’s withers.
Just remember not to compromise on fit. A poorly fitting saddle can cause your horse a lot of pain and can often be the root cause of performance issues. It’s definitely worth getting a professional opinion.