As mentioned already.....barring proper stands, don't try it alone!
One side at a time!! Measure your desired drop on the tube, below the lower triple clamp. Mark it, apply tape or a hose clamp. Loosen all but one pinch bolt while a strong helper unweights the front wheel pulling towards/against the side stand. Stand down of course. Loosen the last bolt -slowly- while applying a bit of weight for the fork to slide up in the clamp. When in position, snug that bolt and the next most accessible. Finalize torque on all bolts...Repeat!
Not alway perfect to avoid binding but if done equally it's as good as it left the assembly line!