Elizabeth,
For minimial lifting of supers, but this is time consuming, visit
the beeyard the day before removing supers and put on a bee
excape. I like the triangular ones that are on a inner cover. The
next day, early, bring an empty super-no frames - on a gardenway
cart. Take the frames out of the top full super and put them into
the empty super on the cart. Then take off the empty super and
fill it up. Continue on through all your hives. You can modify
this to only take six frames out then lift the rest off, in any
case it makes for less to lift.
I would not change the supers for mediums. Keep them and use
three mediums in place of two deeps, or just leave the deeps
alone and get help if you need it to look in the bottom deep.
Bill T
Bath, ME