As usual, the information and tips are plentiful as well as tried-and-true methods that people have employed on many occasions. However, we won't all agree on everything and that seems to be the case here.
My car sits with a rake, so if I don't jack up the front then the brake lines that run horizontally are actually aiming up in the rear. Opening the bleeder would accomplish nothing by itself, as an air bubble wouldn't travel downwards to the front of the car before rising to the master, and gravity isn't enough to guarantee it goes out the back. I'm not a fan of gravity bleeding either, be it drums or discs because it never seems to work completely, at least not in my garage. I also don't trust it on a fundamental level since I've seen air and liquid do incredibly odd things that seem to defy logic as well as physics. Adding pressure to the system seems more likely to avoid having trapped air bubbles and has always worked well for me. When at all possible, I prefer the 2 person method, 1 person and a stick, 1 person with a Mason jar half full of fluid, or at the very least: a 1 man brake bleeder/vacuum pump kit.
In recent years I've taken to using the spring loaded "speed bleeders" that you don't have to open and close repeatedly to bleed. I put a length of hose on them, run it to a collection device, and pump the pedal (just like the jar method but without the reversion) I've purchased them from Russell as well as in the HELP! section at parts stores with mixed results- I've occasionally witnessed air going back inside before the valve closed.