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Mark, no one is useless when it comes to starting out in Astronomy, it is a learning curve that we all go through, and things will improve with some practice and help from here especially.
Your 10 inch Dob with a 25mm should give a beautiful view, especially at that magnification, which is not very high.
Some other factors may come into play here, collimation could be out, light pollution, are you in the city, or just plain bad seeing conditions.
I'm no expert, and i'm sure you will get plenty of help from some more experienced here.
Hang in there, it will get better.
Leon
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