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 2010

Garden 2010

photo heavy mainly veggies.

photo heavy mainly veggies.

What’s growing in my pot?

What’s growing in my pot?

Just a few snaps of what’s blooming in my yard right now….

Just a few snaps of what’s blooming in my yard right now….

Things I think are weeds in the Garden of Guessing

Things I think are weeds in the Garden of Guessing

HELP.

HELP.