Position a flashlight or drop light in your attic if the attic light does not illuminate the area sufficiently.
Move batt insulation by lifting it carefully from between the ceiling joists and setting it aside.
Move blown-in cellulose insulation by scooping it up with a large dustpan and placing it into trash bags. Avoid compressing the cellulose in the bags. If you leave it loose, you can pour it back into place when you're finished and it will still have insulating value. Use a dustpan rather than a shovel because it's easier to work with in the restricted space of an attic.
Sweep up the bits of cellulose around the joists with a whisk broom to create a clean work area before you begin electrical work.