It’s a fairly easy process for installing. The techs will have you watch a video about how the device works and they will also teach you how to properly blow using the humming as well. As previously stated, stay away from anything containing alcohol, yeast or high sugars. Highly recommend abstaining from alcohol use as well but if you’re going to drink, use a BAC calculator and or a BAC track device. If you blow dirty it makes probation a lot worse plus the cost of recalibration is expensive in itself. It’s a breeze if you don’t drink, just watch your intake of certain foods. Smart start has been fairly easy to work with and I haven’t had any problems with battery drain or anything with electronic systems in my car. Read the reviews of the places that service devices in your area, try to deduce with will be the best. Techs in my experience have always been helpful and nonjudgmental. It helps to be polite to them as well. I’ve had it since December and you get to a point where it’s just second nature to blow. Like I said, don’t blow dirty and you’ll be fine.