Depending on how far along in your campaign you are and how much money you have, you might be able to get something like the cloak of the bat for bypassing such things, if you can get the ability to find them. Alarm only triggers on tiny or above size creatures...so if you can become diminutive, you can bypass it without any sort of need to disarm it.
Check the date on these threads before you post. If he still had questions two yeas later, he'd start a new thread.
