We were taught how to change pedal felts at Indiana University in our harp tech class. If there’s anything I would feel confident about doing on my own without a technician, it’s changing my own felts. It’s something that needs to be patiently learned, but certainly doable and worth the time to figure out if you can gather the materials- especially when harp techs are hard to come by. In the end it’s actually not that complicated.
This website has a decent explanation:
http://www.harptech.com/Articles/Felts/Felts.html
If you have any specific questions of the process, feel free to ask me.