Welcome, Steve
Sorry not to have seen your question sooner, as it's an important one and good answers could benefit lots of people. Here's my tuppenceworth:
Preventing blisters involves (at least) two approaches:
a) make sure your walking boots and socks are best suited to your feet; personally I find that socks made with Merino wool are the only kind that last more than a day (but my feet sweat a lot

). Smartwool socks are Merino and widely advertised, but expensive;
Foothill used to sell excellent socks that were much better value but sadly their website suggests they may no longer be trading.
My favourite boots are Scarpa ML3s but it's always a matter of finding out what fits your foot shape (and accepting that your feet may be slightly different lengths!) Also if the boots are too hot, your feet will be softened by the sweat and blister more easily, so try lighter/cooler footwear if possible. Maybe use or carry trekking sandals where weather permits?
b) dry out and toughen up your feet long before you set off: this may be as simple as using sandals/bare feet whenever possible for a while, or daily rubbing with methylated sprits (known as surgical spirit across the Pond) or foot-bathing with a crystal of potassium permanganate (best of all, but less convenient).
If you feel trouble coming along as you hike, try changing into a fresh pair of socks or, if things have gone too far, use Compeed or other second-skin protection
as soon as you feel the problem: don't postpone!
For more on foot care, please see our advice
here. Please let us know what works for you, and tell us how your WHW goes.