freezengirl
It seems many lilies can survive being transplanted at various times of the year. Certainly in an ideal world there is a perfect time for everything in a garden, but sometimes that ideal time is when the gardener has the time or energy to perform the tasks at hand.
All I can add is if your bulbs are deep down, perhaps it can be useful to dig a deep hole some distance from them as to get your spade/digging fork a bit deeper down than usual to assure you get the maximum amount of basal roots with you when you move them. If they would happen to develop buds this summer it could also be useful to disbud them as to let the bulbs rebuild.
Wishing you the best of luck with the move of your bulbs
