confused about Finding Traps spell

Hi, I am level 7 Cleric, and in order for him to have "Find Trap" I have to designate that as the spells in his book, and there is only spaces for like...5 spells ..is this true? Because at the Heartstone Gem, there are traps every step of the way, and defeating one monster at a time, the spell wears off quickly. ALSO...How does he DISARM the traps??? I don't see anywhere to disarm them. Thanks so much for any help.

I hate to be rude WHY IN BAATOR YOU DONT HAVE A THEIF?????? They imporant if it is too late dual class a human chacter to a thief most of the traps piss you of e.g. confusion and poison if this happon use i holding spell.

Thanks, in the hint book it said I didn't really need a theif unless I was going to pick pocket and steal alot, so I didn't create a thief....Can I now dual class one of my human characters at this late date in the game??? Thanks!