Hmmm...
If I were a serial killer I'd put serial numbers on my victims. Gotta keep everything organized you know.
I've watched enough crime shows (real ones) to know that cops definitely aren't paid for their brains. I think anyone could probably pull off a murder, it would just be a matter of not leaving anything behind. Wear Gloves, wear shoes that are either too big or too small (so even if they get a shoe print, it wouldn't match your real size) use a knife and make sure the blood spatters away from you (also wear something over clothes so blood doesn't splash on you) most important, analyze the house and the neighborhood. Most people have routines and that will be their downfall. Look for openings so you can get in and get out without being seen. Also, make sure it's just random. If you follow all that and burn everything afterwards (including the murder weapon, I recommend knife. Guns spray gun shot residue, but by the time the cops had you as a suspect, it'd probably be gone as long as you took a few showers and washed the clothes.) If you do use a gun, go somewhere hidden that you can bury it. That way it can only be found by you.
I'd make such a great hired assassin <3
BTW I charge $50 up front so have your wallet ready.
Avy & Sig credits go to Hurricane0