RE: Need help with day 2 of Frankies routine.
My first question would be, how long have you been weight training? If you're not able to do chest/shoulders/tris in the same day, something is wrong. Is your diet correct? Are you doing the exercises with proper form? Maybe the weight your using is too heavy?
I had been weight training for over 8 months before I started Frankie's 3x8 routine, which is to prepare me for the 5x5 routine. It has the same exercises as the 5x5 with the exception that there's 1 added exercise for each day. I'm going into my 6th week of 3x8 & I haven't encountered any problems.
When you make the switch from isolation exercises & barbells over to compound exercises & dumbbells, a good rule of thumb is to start out light & gradually work your way up. Just because you can flat bench say, 150 lbs using barbells for 5x5 doesn't mean you're going to be able to grab 2 75 lb dbells and do the same, especially if you've never done them with dbells before.