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If you don't want anyone to find out that it was you, make sure to bring people that can keep a secret. If one person tells, then your cover is blown! Bring close friends.

The fewer people you bring, the easier it will be to run away and hide without being conspicuous. However, you might find that a big group is a lot of fun. Go on foot, if possible, or bring bicycles for a quick getaway. You can all go in a car, if you have access to one, but make sure that you don't park it right in front of the target's house. With a group, all knock then run and hide together.