I taught beginner and intermediate classes. I always tried to ask what went wrong with a block and then taught how to fix it (if possible) and how not to do it again.
Another problem with many blocks is how were the seams pressed?? The many seams coming together can usually be a pressing direction problem.
We all have little sayings to remember a technique -- curves -- your waist is above your hips == the in curve is above the out curve which makes easing much easier.
Asking the shop owner is a great idea -- she/he must hear problems and sad stories all the time. The shop will get raves when you teach how to solve and avoid those problems.
Good luck and let us know how you are doing.
Mim