What I wish was different
Research is hard. Be ready for weeks (months) of no data, failed experiments, frustration, not understanding, and boredom. Also, since you are the lowest on the totem pole, you will be responsible for making buffers, filling pipette tip boxes and other busy work that needs to get done for the graduate students. However, this is only a small part of the experience and you will also learn from this. Mostly though, research is hard.