Sticking point? Aside from lack of instructors leaving me grounded for months... Power off landings has probably been the hardest thing for me. Judging them right is hard! In the old 172N with 40 degrees of flaps it's no biggie, with everything hanging out you're dropping like a brick... In the 172R/S with only 30 degrees, it's still tricky! Working on it tho'...!