Standing up straight gets easier the more you do it. A good idea could be asking a friend or family member to discreetly remind you when you're slouching.
They are referencing pulling the actual joint. If you wish to tune using the rolling method (which I do not condone, since better tone comes from having the flute rolled...
If you like the look of straight, even bangs, it's okay to cut your bangs straight across. For curly hair, cut every curl so that they fall to the same...
The seeds need to undergo a process called stratification, where they are chilled to winter temperatures. You could plant them outside straight out of the berry, but they may not...
Remember that you're never really trapped. You always have the choice to leave, even though this might bring a whole set of problems and inconveniences. If the situation is really...