Regardless of how you do it:
Don't text, email, call or google (use the dark web).
Cameras are everywhere....remember that. Cops can have zero evidence but magically gain access to you sneaking out of someone's crib via street cam.
Harder to pull off if you're close to the person. You'll be a prime suspect.
Disposing the body is probably the best way to go but can greatly increase the odds of a major fukk up.
Do it solo...friends helping only complicates things unless they feel the same or stronger than you do.
Ask yourself "If I get caught and have to serve life in prison.....was it worth it?" Most likely not.