Lock the cams to remove the HP fuel pumps? I haven't done this repair myself yet, but I don't see why you'd need to lock the cams unless you're removing the chain from the fuel pump cam. The pumps just run off some kind of tappet, right? So removing the pump shouldn't mess up the timing - at least to my understanding. I don't think you even need to remove the valve covers, just the fuel lines and then access from below through the wheel well.
Pulled up the manual, and they don't mention any need for cam lock. Manual tells you to remove a motor mount and the alternator to gain access. It also says to discard the high pressure fuel lines. Not sure if that's all really necessary. I have a feeling the motor mount removal is to get access to the fuel lines for complete removal. If reusing the fuel lines (which they say not to do), can probably skip the motor mount removal. Again, though, just looking at the pics in the manual, which can be misleading.