Using the clear catcher bottle is nice... you can examine the stuff coming out... and not spray it on you hopefully...
but unless you have one of those one way bleeder valves attached ( which I have never seen work great )... you have to be in charge of the ' gate' nipple....
and it must be a one way function... fluid coming down and out..
and fluid being replaced from the ' tank' at the master cylinder...
if you mess up and let the tank get low then that is the same thing as letting air in from the bottom... you just start over following the rules and it will work out..