Start off low and just do 0.25 mg for a couple of days to a week, and then cruise on 0.5mg for a couple of weeks until you reach your desired tan level. After that, maintain with a couple of injections per week at 0.25-0.5mg, btw you still have to get some UV exposure with this it just speeds up the process of tanning by boosting your melanin production and melanin still needs UV to activate and darken.
NEVER use it when you have freckles or moles on your face that you don't want to darken, because this will 100% make them darker. Also if you're a guy, this can and probably will give you random hard-ons. Also, some minor stuff includes nausea and flushing after pinning MT-2, but that's mostly whatever, though it can get bad for some...