I have been working on playing this instrument for many years. It is interesting, and easier now that electronic tuners are widely available (sort of like the 12-string guitar). You have to start slowly, with easy songs. You also must pay attention to left-right-left hand technique as a beginner. So this is an instrument that is diffficult to self-teach. Peggy Carter (peggycarter.com) is a very good player (she lives in Texas) and gives monthly lessons online, for all levels. She is also a good teacher and the multi-level approach is effective. Speaking of hammered dulcimer, check out these interesting You Tube videos --
Use of hammered dulcimers for "Dutch hop" dances:
https://www.youtube.com/watch?v=S9zIFwm8cJYHistory of Dutch Hop in Wyoming:
https://www.youtube.com/watch?v=Qvmayb9Ics4Red Desert Ramblers, from Salt Lake city, use the hammered dulcimer front and center in traditional/bluegrass:
https://www.youtube.com/watch?v=GKr4z9XPK_4