just did the job this past friday, pretty straight forward, pulled the wipers off by renting a tie rod puller from oreilly's and they came off pretty easily (california car up until recently). then pull the -pillar trim off, remove the top of the battery and braking system compartment covers so you can pull the weather stripping off the cowl. then the cowl pops off. I cut up a water bottle and siliconed the top over the part that sticks beyond the windshield. Then I dumped water on it from the windshield to make sure it would work in the event that the cowl fails again. After that I simply clipped in the new cowl into place (make sure you push in all the clips, reference the old cowl to see where they are). I Put the weather stripping back and put the a-pillar trims on and then the wipers. Finally I replaced my cabin filter.
NOTE: I bought the a pillar trim rebuild kit from atlantic british and it was a POS, does not water seal the a-pillar. I have to duct tape the trim pieces for now while I order the clips from a genuine Land Rover site (they are NOT cheap)
here are some photos