congrats bro! as helimike said, look for tips and tricks. there are some parts that are a tight fit and seem harder than they really are, that's where the tips and ticks come in!
on my last E5, I had to actually polish the tail rotor output shaft to get a very smooth feel. I usually do this on all of my helis just to be sure, but the tolerances are so good and tight that I needed to do it on this one.
you will really love this heli, flys amazing! I stretched mine to use the 626mm blades, and running on 12S, I am loving that size heli now!