Planning is the key. extract your revenge carefully whatever it is, maybe pay some other local scroat a tenner so you can't be done for it. A camera connected to a recorder is handy to capture reprisals.
I had 2-3yrs of hassle with 2 retards, started with bullying my kids, I kept warning em I'd have em one day, but as I only went as far as threatin em it still escalated into my car bein damaged when they were 15.
I set the cam up and one night got the evidence , I gripped em (off cam..!) and smacked their fuckin heads together twice , They fell over each other and ran off, and phoned the Police and said I punched em.
I said to the PC I'd surprised em when they passed my house and one had turned and run into his mate, clashing heads which their injuries clearly supported..
They were fined for criminal damage and have never even looked at me since.
This was 4yrs ago and I wasn't surprised to see 1 of them in the local paper last week sent down for 6yrs after stabbin an old bloke who owned a shop.
You can beat the bastards, just use their lack of intelligence against them and they'll hang themselves.