Hi Chris:<br /><br />First of all don't worry; although knowing such things as vowel quantities and accentuation are a great help (Frankly, I don't know how people get by without it.) it is still not something that will hold you back from switching over to a Classics focused department. In truth, sad as this is to me, most people pay no attention to vowel quantity and accent when reading.<br /><br />You would still do well to learn it, as it will help you a great deal in reading verse correctly and in scanning it without a problem, and also because there seems to be a fresh surge in interest in the reconstructed pronunciation, so if you decide to continue in Classics professionally you may be a more popular candidate if you can read it with attention to all of these details. That wouldn't be such a bad thing in a field in which many will find no work. But again, you don't have much to worry about when switching over to an undergraduate programme in classics.<br /><br />Good luck,<br /><br />-S.<br /><br />PD The sooner you learn the right way, the easier it will be for you.