If you don't get a stool/chair you will get a chronic case of "dobber's back" which is a permanent ache and hunch. With the focal length of a 10" dob, if you are of average height, any stool/chair will do in the beginning, I use a folding camp stool with a platform for when the scope is on the equatorial platform and I can get to any eyepiece height easily and confortably.
Cheers
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