We're not liveaboards but bought a boat in Croatia last year and have been over there 7 times this year for a week or more sailing.
Marinas very expensive for overnight stays compared to the UK but almost never use them outside our base marina. Have explored Sibenik to Mljet - the middle bits - this year with many excellent anchorages and restaurants, and only once had trouble finding a space provided we came in late enough in the afternoon for the day-anchoring lot to head back to marinas for the night.
Never once been checked for paperwork although we have kept all the bits up to date.
Absolutely love the country so far, especially since a forumite gave a good way to understand their manner, "Think of Yorkshiremen with tans". it's so right - you can share a laugh or receive congratulations with just a slight twitch of eyebrow.
Don't like 777 though - we have it and it's comprehensive but gives very little more than a detailed chart does. A book called Adriatic Anchorages has been our bible - photos and subjective narrative from a long established local.