If you think your soil is acidic, then fine - if its alkaline, it won't do too well.

I have planted directly into the neutral soil. Treat them as you would heather or rhododendrons in your garden.

By the way Guest blueberries are a lw growing shrub not a tree.

Maybe they're thinking of Japanese Blueberry Tree? Or does that grow "over there"?

I think it would be borderline hardy but that could be what Guest means - no way to know!