Unload the filament and allow the hotend to cool down (otherwise you might jam your hotend). Turn off the printer and remove the power plug.

Remove the spool and its holder.

During disassembly, it may be useful if you mark each smooth rod to identify it for later. A piece of tape indicating the x, y or z axis, for example.

If you have a doubt about what the part names are on your 3D printer, take a look at Prusa's glossary for the i3-series: https://help.prusa3d.com/en/article/glos...

Double check the printer is not connected to the outlet anymore.