Hello and welcome fellow oneironaut =) In the beginning you will wake up from your dream immediately, either of excitement, fear or that you focus on your physical body because you are not used to focus on the non-physical or dream. So the only cure is to keep practicing until you no longer have this issues, it happens automatically. When the dreams are fuzzy look at your hands and when you feel the dream is more clear, slowly look at other objects in the dream, but if you feel like you are losing control look back at your hands.

I hope this helped and good luck =)