If it's open hardwoods, fire lines are easier than you'd think. I bought the most powerful backpack blower they make (Echo) and a 6-10' firebreak down to the dirt is fast and easy. We already had ridgetop roads, but got a dozer in and created hollow roads not just for better access, but also fire breaks. I also walk these roads with the blower. On steep hillsides, I'll walk down blowing to the bottom, then just have to walk up the other side. I blew a 7 acre unit perimeter last year in about 30-45 minutes.
Basically, if I didn't have a good backpack blower, I wouldn't be getting much (any) burning done