Wear a mask that looks like a humans face, use common pistols or just stab the man, keep it quiet and use outfits that you can abandon with ease, check for cameras a week prior, find a safehouse that you either broke into or can guarantee it's safety
Or carry your phone in a faraday-pouch when you're in a area where you dont wanna be known to be. You can make one yourself pretty easily. Just unbag to ping it in a plausible area.