Knowing one's limits and careful practice of uncertain skills are indeed very important lessons which I am glad you are learning, but I do hope in the future you need not learn them at the expense of the well being of yourself or others. Twilight, should Rainbow Dash require any additional healthcare, it will be provided from your stipend, and you may be required to attend a basic unicorn's first aid course at your own expense from Ponyville General. Friendship is one thing, but I take very seriously the well-being of all my little ponies.