I've never bled my brakes before, but I probably should and I know that Speed Bleeders are well-recommended. My stupid question is... if you're bleeding the brakes by yourself (which seems to be the point of Speed Bleeders), how can you tell when all the air is out? It seems like you'd have trouble seeing the hose while you're working the brake pedal (especially when bleeding the right side).

Also, what's the best way to completely change the fluid?

Thanks!