Here is a short article I found on line. It seems difficult for a novice. I would suggest checking out the video about changing the resistor. If your symptoms are like those talked about in it, I would try changing it. If not I would take it to a good mechanic. I hope this helps. Good luck! To use the link, tap or click on the blue link.
RE: blower motor 1997 dodge dakota
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Try an auto parts store or rockauto.com.
Replacing it is a challenge. The entire dash has to be rolled back and the heater plenum removed. You'll have to discharge the a/c and drain the cooling system.
Be sure it really is the motor before you tackle this and if you do, replace the heater core while you're in there. It's cheap insurance.
https://m.youtube.com/watch?v=B2_wIMT1EQ0