Hi Larresha, I find if we are doing treatment on the LLQ I will either use my finger or a mouth mirror to retract the soft tissues as it helps me to see better. I hold the suction in right hand and use my left to retract. Then if we are doing treatment on the ULQ I will hold the suction in my left hand and use retract with my right hand.
Also if you find you are struggling on angling/or where to put the aspirator, ask the dentist where they want you to go, they wont mind. Or if not just aspirate on the opposite side and the back of the mouth!
Hope this helps!