Hello Jason,
Remove the tailstock, motor and rear mountings for it. Take off the topslide as a complete component.
Move the saddle down to the far end of the bed and lock it in place with the clamp to the bed. Close the 1/2 nuts onto the leadscrew for good measure.
You will need help with the next bit. A suitable length ladder with a stout board up the centre will be a suitable 'slipway' to pull it up into the loft space with a decent rope round the headstock end. Make sure vulnerable handles are well protected in bubble wrap and haul the carcass up into the loft, with someone at the ladder bottom propping it up with a hefty lump of timber fitted onto the ladder rungs as you go.
That will secure it in stages while you take deep breaths and tidy the bundle of rope building up around your feet.
I assume you have floor space all ready to receive it up there
Regards
Brian