Easily - even without previous knowledge!
The replacement of a blunt knife takes only two steps:
1. Place the sharpener on the platform. Press and hold in one hand and the knife in the other.
2. Put the blade end into the sharpening edge, keep the blade edge perpendicular to the table, and do not swing left and right.
3. Press down with the strength of the daily sharpening knife, and pull it backwards. Do not push or pull back and forth.