Best instruction material?
Dulcimer Resources:TABS/Books/websites/DVDs
How well you can learn on your own depends on many factors.
What is your previous musical experience? Have you taken violin lessons or learned to play some other instrument by ear? Can you sing folk songs? How is your sense of rhythm? Any such experience can either help or hinder your learning.
As a starting point, you should be trying simple songs which you already know, and work from clearly printed TABS for those pieces.
Have you? Can you share some advices on what courses to take?

There's hope for me yet!!