Plugin and turn on the printer.

Using the screen menu, move the X axis up until it crashes in to the Z tops. The stepper motors will skip, making a noise - this will not damage the motors.

If, using the menu option, you are unable to raise the X axis to the Z tops, unplug the printer and plug it back in. You will now be able to reach the Z tops.

Using the screen menu, move the X axis down until the nozzle is approximately 10-15mm from the heated bed.

If you are using the Bear X axis (BearExxa, BearMera, Bondtech on Bear X axis) or the Original Prusa MK2(S)/MK2.5(S) X axis you need to release the tension on the X smooth rods by unscrewing the tensioning M3x10 screws a few turns. (Note! These are different to the Bear X axis belt tensioning screws.)