Remove the black screws on the right side first. When re-assembling, install them first.

A right-angle attachment can also be used. A mechanic's mirror is also helpful because you can't really see a few of the screws unless you're a contortionist.

Replacement rollers are available as a kit from Amazon for Cricut Maker 3:

Amazon.com: Kimalab (Pack of 4) Replacement for Cricut Maker/Cricut Maker 3/ Cricut Explore 3 Compatible, Rubber Wheel Mat Guide Rubber Roller/Wheel Pack Compatible with Cricut for Roller Repair : Arts, Crafts & Sewing