I am only 5 foot tall and when I ride western I use the method smrobs describes above. Works like a charm! English I pull as tight as I can, walk him around, cuss, pull again, rinse and repeat until its tight enough. Building upper arm stregth helps compensate for height also. I lift light weights and girthing has gotten easier.
Also I only tighten so the saddle doesn't slip. Most people could and probably would tighten more on my boy but I simply don't have the leverage. I also alway use a mounting block so it doesn't slide when I mount. If you have any other short people/ tall horses questions I would be glad to help!
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