It will take quite awhile for the nervous edge to go away... Unless your a dr. or nurse or some shit.. But for the most part theres nothing to be nervous about. If your getting alot of bubbles in your dart let it sit overnight with the bubbles heading up. I always thought if you had even a tiny bit of air your brain would explode ! lmfao! Its a myth... although its not a good habit a healthy adult can withstand some air...just try and make sure it doesnt happen. as far as the worrying about the oil you got off the internet dont be nervous. its very rare to have anything bad in oils.. most of the time if its a bad source it will just be underdosed .. Just bust your ass in the gym eat clean and rest well and watch your body morph !