There's a fair number of tomes on the subject, though they're fairly dry and academic in nature.<br/><br/>(She can spend 1 hour and make a DC 20 Know: Arcana check, to get a +2 bonus on the UMD check to adjust the wards. Every five she exceeds the DC, she adds 1 to the bonus. She may retry the check as often as she likes, and simply takes the largest bonus at the end; it would take two days to take 20.)