How far away you want to move the hive is the main consideration.
When it's only a matter of a few meters away, you can do it in small steps of 1-2 meters every night till they reach the final spot. The bees should have no trouble adjusting to the daily small changes of location. Each day they will adjust within a few hours, to their new position and take it in their stride. When dealing with a lot of hives closely parked (not your situation), don't try this since the confusion will have them wandering to other hives.
But, as you stated, you are moving them over five miles (8 km) away, so you can make the shift in one step, over night. They will realize that they've moved as soon as they "step outside" in the morning, and since they are outside of their flying range, there is no liklihood of their returning to their old spot. IMHO, the "something in front of the hive" isn't essential, but it can't hurt either.
Before you move the hive at night (the preferred time, since then all the bees are home and you won't lose those in the field), use some smoke to prod them all inside the hive and be sure that you have closed the entrance well enough to keep the bees inside, but not so thoroughly that you will suffocate them (a loose rag or some screening pushsed loosely into the entrance is usually good). Bees that get outside in the dark are generally very touchy and quick to sting. Many of the folks on this forum can tell you stories about their experiences with bees in the dark.