I want to install increased flow injectors on our '95 PSD.The Ford dealer said removal & replacement of injectors by an individual is highly NOT recommended,due to the following:draining the heads of fuel & oil,special tools required, a/c comp r&R,wet looms,time involved,bleeding etc...on and on... Is injector r&r best left to a dealer or can I expect to do the job myself in a reasonable time with a minimum of cussing and headache?