I don't want to come off as alarmist but some of the ingredients in DIY
juice can kill you. One drop of 100mg/ml nic on your skin can kill an adult (it's a neurotoxin at that strength). You should read all of the stickies here:
DIY E-Liquid
edit: notice I said "can kill" a heavy smoker might only get very sick, a non smoker would at least need to go to a hospital. A child would die. I mix my stuff in a clean room with an air supply mask and chemical resistant long sleeved lab coat and nitrile gloves and a face shield. Be careful.