I recently was successful in replacing the driver's side outer cv boot in my 3.0. There are several specialty tools required to perform the job and even once you do rent or buy the tools the procedure is time consuming and extremely messy. IMO, it is definitely worth $250 - $300 per side if both boots are done by an independent shop. This is the price I was quoted when I was half way through the job and ready to give up. There is a high probability of damaging the shafts if the job is not done correctly and then it will set you back approx. $600 - $700 for a refurbished replacement shaft. This was quite a task even for me. Some background on the DIY's I've done: Water pump, thermostat, belt tensioners, control arms, final stage resistor, and brake rotors and pads on the X; Engine, tranny, diffs, xsfer case and everything in between on a 78 F250. If anyone still insists on a DIY, I would be glad to help with any specific questions.