Are you using the crappy insoles that came with your boots? If so, go to a good sporting goods store like REI and talk with someone who really knows boots/shoes about replacement footbeds. I use SuperFeet, but Sole is another brand. Blisters on the heel are often caused by your heel being able to move up and down in the heel cup, and replacement footbeds can help lock your heels in place better and eliminate the movement.
Alternative lacing methods allow you to more securely position your heel in the cup, too. YouTube has a million videos showing a million methods.
I've gotten blisters on the tops of my toes before, they came from creases in my sock. Good quality socks in a properly fitted boot won't slip for quite some time while on the trail. Be prepared to fork over $20 or more for a good pair of socks. My favorites are Darn Tough as mentioned above, they're a very fine, dense weave that stretches to fit your foot perfectly, and the smooth exterior slips right into boots and won't bunch. They also have a no questions asked lifetime warranty. I've been wearing the same 8 or 10 pairs nearly every day for almost 2 years, and they feel just as good now as when they were brand new.