I am handy but never installed a heated hardwood floor. I submitted my layout with measurements and got back a custom floor plan indicating how to install; breaker, load, spacers and where I should start. More than half way thru rolling out more than 750 feet of wire, I thought I was going to have too much which would if been a problem. But it was perfect! I was just 3 inches short but likely due to my spacing.
During our first winter, the product worked great. Our kitchen was so comfortable and evenly heated. No more electric baseboards with heat at either end of the room.