Assuming it's not a 'crash & burn' emergency ... a.k.a. not a 'hurry up' emergency/abnormal procedure ... I'm obviously NOT talkin' about engine losses, etc. ....
You ALWAYS need to go the the CB panels FIRST !!! Sometimes you can solve the whole problem by referencing the CBs ... I taught that for 1,000 years and IT WORKS !!! Any airplane, military or civie-street.
If you can unnerstan' and find things on the CB panels (if they are designed properly, and most are ... they will usually represent a 'system diagram') ... then you can unnerstan' WHY you do the procedures.
If you understand the 'why' ... a.k.a. the whole thing makes 'sense' ... you'll stay WA-A-A-A-A-A-A-A-A-AY ahead of the aircraft (which is the object of the exercise) and you will get it 'right'.
I did it that way in the airlines ... I did extremely well on each & every check-ride for 25 years w/ that philosophy ... and so did my STUDs.
Q.E.D.