Running electrical wire through the channel between ceiling joists is generally easiest.
Running wires in insulated ceiling no attic.
Here is how to fish wire through a ceiling.
There are two ways to insulate around wires.
First you can tear or cut the insulation sheets in half and lay half behind the wire and half in front.
In addition your light fixture may require mounting to a ceiling joist or to two short blocks nailed.
For vertical work you can cut about 6 inches below the wall ceiling joint drill through the top plat and then fish from the opening ion the ceiling.
If the wire is too tight to the wall to make that easy you have a second option.
Locate the wall studs with a stud finder in the area where you re snaking your wires.
New lighting cable computer networking and sound systems can all require wiring that may need to come through the ceiling.
Cold cobweb filled crawl spaces damp basements and tight attics are all just a part of the job.
Worst can you open the ceiling 5 inches from the wall and work from there.
Tear the sheet across the width instead of tearing it lengthwise.
A 3 inch strip of drywall is enough to run receptacles around a room.