I don't have a How-to but you can use my pictures as a reference if you want and ask questions if you have any. I did a little more work to mine but you can see the basics in the pictures as well.
Dropbox - Wiper motor
Usually you don't need all that.
The two gaskets are the only new parts I needed.
DMT MOPAR 69-73 3 Speed Variable Speed Wiper Motor Switch Plate Gasket
DMT MOPAR 66-80 2 3 Speed Wiper Motor To Cowl Seal Body Gasket Dart Charger
They are $5 instead of $100.
