What kind of problems are you having? Are you having trouble cutting to the correct length or are you having problems making tight joints? Its difficult to miter tight quarter round joints because most houses are not exactly square. That is, the corners are not exactly 90 degrees. Its been my experience that one or two are close, but one is always way out. You can cope the corners and get a much nicer joint. Its not hard, but it takes a little practice. Transfer the profile from the end of the quarter round to the side of another piece of quarter round. Back cut the end off using a coping saw, making sure to cut shy of the line. Clean up the end with some sand paper and you're ready to go.