You, as well as the other beginners, should stop trying to out-think the programs that you use and just follow it. That is the recurring theme on a lot of these threads..... i.e. Can I substitute this for that? Can I add thirty million chest flyes to the dumbbell presses?
Stick to the program, to the letter. Only after you've completed it, would it be prudent to make the assessment that maybe you didn't get the results you wanted and may try to change it up.