220 outlet

Hi: We have a 65-year-old home with the original BX, armor-cable wiring. The wiring is without a ground, and the wire insulation is cloth and very brittle. I'm thinking of replacing the old wiring with new. How likely is it that I'll be able pull Romex through the armor cable? From what I'm able to tell, often a ceiling box is used as a junction to outlets within a room. I was thinking I could disconnect the wires from one of the outlets, tape the Romex to the old wire and pull the wire at the ceiling box, along with the Romex. Has anyone tried this? Do you think I'll get hung up mid-run? Would I have better luck pulling three separate wire? Thanks.

my house has recessed lighting almost everywhere. i've noticed that (different from my previous place) that these lights cast a fairly harsh downlight, even with flood bulbs - i think at least partly because there is no light scattering off the ceiling, as i would get with traditional fixtures. the situation is more severe in the basement, where the ceiling is about 7'6, rather than 8'2 in the rest of the place. any ideas on how to diffuse the lights more evenly? tia bruce