That looks like sound advice. There are hostels along the way as well as camp ground (for instance there's a very nice one at Pigeon Point south of Pacifica, in California) and you'd probably like them.
It isn't like Ireland and things are pretty expensive here. Bit more people than Connemara and the traffic is simply ugly over large sections of road. Wear VERY bright colors and you'll learn to hate old fools driving motorhomes.
Washington's route is OK. Oregon is beautiful and the drivers are typically polite though often hurried. Northern California section can be absolutely terrifying. Often the road has little or no shoulder and old fools in motorhomes give you 1 cm of clearance. Often their side view mirrors will pass directly over your head. South of San Francisco and all the way to Los Angeles things are a great deal better though road work can screw things up.
The ride is very nice. Usually a tail wind. There's a great deal of climbing since the coast is rather high. Nothing very difficult though. he scenery varies from interesting to spectacular. You get to ride across many bridges including the Golden Gate Bridge which is something you'll remember. 10' wide sidepath and a view all the way out to the Faralone Islands on a clear day. (Though I've never seen them.)