I don't think the video mentioned anything about an electron microscope.

Jon Larsen is basically an amateur scientist that figured out what micrometeorites would look like by a process of elimination. Clearly a regular microscope is sufficient for this.

The nice images from Jan Kihle are due to a camera/microscope system that takes a snap shot at different focuses to make a composite picture. It wouldn't be an electron microscope.

This is clearly within the range of amateurs if you have a microscope & the book and just get good at eliminating unlikely samples.