To run the wires inside rigid conduit you ll need a hacksaw a pipe bender capable of bending 1 2 in.
Running wires without attic.
The attic wiring should be protected and secured to ceiling joists or other wood structural supports.
Bring all of the wire up into the attic.
Running wires without attic or basement.
Rigid conduit with an outside diameter of 3 4 in and a fish tape long enough to reach through the buried pipe.
Run the wire or cable to its destination.
While one person holds the flashlight the other person should use a staple gun to run the wire along the rafters from one entry hole to the other.
Running wires inside rigid conduit.
Then run the wire and cover it with a nail plate.
If you re working from the attic you can drop a weighted string down wall cavity then attach the wire to the string and pull it through.
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Prepare for that by moving insulation away from the walls through which you need to pass the wires and marking the existing wires you need to remove.
Converting an attic to a bedroom and bath.
Yes this should be corrected and it would be good to have the wiring and all the circuit connections inspected as well.
The staple gun should be loaded with wire staples designed for holding the size and type of wire you are running.
Attach the wire or cable to a fish tape or coat hanger using electrical tape and feed it into the hole until it reaches the opening at the other end.
Calculate the proper amount of wire and the most expedient routes for the circuits.
The actual install of recessed lights here https youtu be 5yc8aqnvqqg the long bit is actually used.