It'll be a big plant then if it's 5 years old - you'll need to take a hefty rootball with it or all the roots will have a really hard job settling in again.

Dig a hole twice the size of the rootball, backfill with the same acid soil/acid compost and water well through the year.

I wouldn't bother moving it though if you're not confident that you can get a big enough rootball out of the ground because it'll be the equivalent of a bare root plant and i doubt it would survive the shock/distress.

And this is not the time to be moving, wait until autumn now.