Lost Cannon Safe Combination

I seem to have (stupidly) lost the combination to a Cannon safe. I found out the manufacturer of the lock used (LaGard). Since this is in my home and time is not an issue, any chance that an amateur could "manipulate" the lock to determine the combination if time is not a big issue? Of course, I would prefer not to have to try all possible combinations. If not, can anyone refer a safe tech in my area that might be able to open the safe without drilling? Thanks, Greg