Do it yourself? I am too cheap to pay someone unless I just cant do it myself. Head gasket, timing belt and water pump on a Subaru $350 which includes paying the machine shop $100 to shave the heads. The same job from a local shop would run between $1500 to $2500. Slight cost savings there. I have done it to both my Subarus. Front wheel speed sensor on a Dodge Journey cost $150 each installed by the dealer. I bought two for $50 and spent 1/2 hour putting them in. So much cheaper. Hot Tub wiring, wire cost $50 and I already had the inside breaker. Electricians estimate $750. Doing it yourself is fun.