First, specializing is NOT easier than FNP so get that thought right out of your head.
Second, take a deep breath and think logically. There is no rocket science going on in an exam room with a patient. What is the pt's complaint? Once you know that you go through a logical questioning process pertaining to that complaint. You've got to pull your anatomy/physiology, psych, chemistry, pathophys, all together at this point and use them with the pt's history...and think. This process can be impeded by trying to hurry, so don't. Better to learn a logical thought process and be able to apply it every time, then you can speed up later on.
For instance, let's say the complaint is "cough". Well you know anatomically that cough is going to involve the respiratory, cardio, and/or GI systems. Look at the pt's history...any hx of asthma, COPD, allergies, chronic sinus infection, tobacco use, HTN, CHF, GERD, etc. can help point you in the right direction OR eliminate one possible direction entirely.
So let's say our "cough" pt is a long-time smoker who is using 2 inhalers on a daily basis...now you have some direction for your exam and your differentials.
What if the "cough" pt says his cough is worse at night, but he also gets it when he's in gym class...now you have direction that might lead you to testing for asthma.
Ask the questions, listen to the answers, and most of the time the patient will tell you what's wrong with them.