I learned basic CL building/flying when I was a pre-teen at an overseas airbase. I could loop and perform a wingover. I became much less active in the hobby when we relocated CONUS but dabbled a bit while in HS. I built a Top Flite Flight Streak Jr with a Fox .15x, 8-4 wood prop, no LG and a simple silkspan finish. I managed to master inverted flight with this setup. It was only with the help of reading stunt articles I started doing the S maneuver where, at the top of the inside loop you reverse control and do a half-outside loop. Then you start extending the inverted portion of the maneuver until you can do several laps. I practiced inverted flight quite a bit.
Things got set aside again during college when work/school and other hobbies got in the way. When I returned after graduation/military service I hooked up with the (then) Seattle Skyraiders and entered a few of their contests - doing the simple round maneuvers in Beginner Stunt at a few contests. I ran into a mental block trying to fly the outside square loop. Splattered many models into the asphalt on the 2nd (and lowest) corner. Strangely, my highest-scoring maneuver was my inverted flight. I think I was awarded a 35 point score once.
I got very discouraged at that point. I could do all the round maneuvers but those squares still presented a mental obstacle. I finally figured out my hand position was way over my head when coming down the vertical leg of the outside square. Even though I knew what NOT to do it was pretty difficult to break this form habit. After getting my son active in CL and RC flying, he got interested in other activities and now is away at college.
I think I've flown 2 CL flights in the past 7 years with the most recent flying in a CL racing event yesterday.
I'm currently building a profile stunt training w/foam wing cores but the epoxy I mixed up to glue the cores together never set up. I had a perfectly aligned wing with a forever gooey center joint. Took a table saw to it and will rejoin with a 1/4 balsa spacer and fresh epoxy.
Armed with a new (and straight) inexpensive stunt trainer and Hunt's article, I'm ready to tackle and this time, master the full pattern.