Going to be a big jump from the RV-12 to the BK-1.3 in handling. Take small steps at a time.
More of the "sage" advice I've been referring to.
In my first Sonex I may have been surprised if I had not driven to another state to take a ride in one as I had been flying a Challenger ll CWS. The Sonex was VERY different in handling than the Challenger. I had experience in a number of planes, and between the Challenger & the Sonex I flew a variety of similar and not so similar aircraft with other pilots and my instructor.
I did the first flight on the aircraft (Sonex) and felt qualitied to do so but I spent a lot of time in preparation. Some may have thought I had lost my mind sitting in the plane and "flying" the initial flight while in the hangar ... several times. Building muscle memory, knowing where to look for certain information, and committing the view over the nose to memory.
Speaking of ultralights ... a friend had bought a Legal Eagle (40hp Mosler). Flying that one was eye opening as it took a bit more tailwheel skills than anything I had flown up till then. Another tricycle gear pilot taxied it around and it shook him up so bad that he told me he considered us tailwheel pilots to be gods. Told him it was just another skill to learn.
Insurance for planes? I didn't used to but then the reality of liability came to me, especially if a passenger was involved. Last few years I gained hull coverage as the cost was reasonable and I'd like to get something back for my troubles if I have a good but not so great landing.