No worries man! I tend to encourage learning rather than discourage. None of us learned our trade or even basic motor skills our first tries
Best piece of advice I can offer is BE GENTLE and PATIENT! If something doesn't fit right with the slightest pressure, it is most likely misaligned. Stop, look at the parts again (rewatch the vid if you have them up while doing it) and retry.
Remember, it only takes between 5-8 pounds of force to break a human elbow joint