there are many different ways to achieve results...if the two bar clamps work for you,keep on with it...i use a combination of bar clamps and spool clamps on everything...and i usually prevent joint slipping in different ways.finishing nails in unused areas,wax paper-backed straightedges,stuff like that.nothing set in stone.
the only thing i would not do is wait too long before clamping...max 5 minutes,usually less,before i get the clamps all set...and i do the squeeze out gradually...1/2 turn here,1/4 turn there,until all clamps are snug.
main thing is,on a wide joint such as a neck lam,waiting until the glue sets a hair can result in the middle section of glue getting trapped in there...i want as thin a joint as i can get..and for me(and most others i would guess)that means having the main squeeze out occur while the glue is at it's runniest