Like most have already said, if you can do it yourself, do it! I did my first a few years back as a trial and I've done dozens of heads since then, for myself and others.
It's easy do to and cheap. There are plenty of ways to do it, if you can't get a propane burner to do it outside, you can do it inside the house with a cheap sous vide machine which won't stink up the house or on the stove if you are daring enough.
The pressure washing part is easy, when it's simmered long enough, take it to a car wash if you can't do it at home, just clean up after yourself.