As a lefty, I have found that my teachers were more concerned about my differences than I was .... and, I couldn't teach my left-handed daughter to do anything!
One of the things I found helpful in learning new things (it may just be the kind of learner I am) is to have the sample as you indicated ... but, if in a situation where you are sewing the same seams over and over (as in sewing two patches together), I could learn it easier if someone did it five times in front of me. (I worked at a factory, and production was the name of the game).
Whenever I was moved to a new operation, I would have my supervisor sew five pieces so that I could see how she handled the fabric, what it would look like, how she held her hands ... a myriad of things you do while sewing that you don't even realize.
I understand about "if it is worth doing, it is worth doing correctly the first time" ... I was blessed to have worked in a factory where quality was definitely a must! I have always appreciated good standards and ideals.
I always worry about a beginner becoming so burdened with doing it EXACTLY right that they become discouraged.
It is similar to most quilters "sew an exact 1/4 inch seam allowance" (which in some piecing is extremely important) ... versus my friend, Mary Ellen Hopkins, who says "PPM" - - personal private measurement, the key is consistency ....
And, I so agree with those who have encouraged you with "enjoy them".
I didn't like teenagers when I was one, but I learned how to celebrate their individual personalities and gifts. And, to be able to teach a young one how to celebrate who they are in a productive way is a true gift for yourself. It is really amazing how a simple word or sentence can make their world different for the rest of their life. A big responsibility but such a blessing, too.