"stupidity and impatience"
No, it should be "Naivete and enthusiasm".
This may be the best, least expensive lesson you'll learn all year
In one step, you may have learned more about how 120 roll fill works than in weeks of more timid approach to the issue.
One piece of advice, which mirrors the other posters - see if you can find a manual somewhere. How to load a film is one of the most important parts of any manual.
Oh, and have fun!