It's not difficult. Get on the freeway in moderate traffic and get in a lane where traffic can run in parallel lanes to you in the same direction of course. If you have your center rear view mirror adjusted properly, just wait until a car is coming up from the rear on one side or the other and gets in your center mirror blind spot. Then, adjust your left & right mirrors so that you can see the parallel cars in them when you can't see that same car in your center mirror.
What was difficult was doing that in the days before power assisted mirrors, but a willing passenger would solve that problem. Plus it's always a good idea to turn your head and check too, objects like motorcycles sneaking between cars in traffic jams are easy to miss.
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