You can do the rebuild yourself IF you follow a good set of instructions and triple check all your clearances, end play, ring gap, etc. The initial start up and break-in is where it's easy to void the warranty, especially if the cam goes flat. I highly recommend ch1ll above advice since you are a novice, unless you can get a buddy who knows Mopars, or someone knowledgeable and local from this board to take you under their wing from build-up to break-in. I'm all for doing it yourself, but the rate of failures people seem to having with hydraulic flat tappet cams, I wouldn't want to see that happen to your freshly built engine. Do they even offer a break-in service?