Transplanting lilacs

Transplanting lilacs

I live in northeastern CT (not sure which zone?) - I have a lilac bush that's about 6 ft tall, on the shady side of my house. I'd like to move it to a sunny spot in the front yard to get more blooms. Is it ok to move it now (it is still dormant - no buds at all yet) or should I wait until fall? Also, I know I am supposed to dig a hole twice as large as the root ball, but what is the safest way to get to the root ball, so that I don't damage the plant?
Garden pics

Garden pics

Iresine and Ipomoea

Iresine and Ipomoea

poppy?

poppy?

In my garden this morning

In my garden this morning

Pretty Tulips

Pretty Tulips

oops!

oops!