What can I expect after having my gallbladder operation?

Good recovery. Generally low risk low pain early discharge from hospital early return to work there can be complications, so be sure you review risks, benefits, and alternatives.
Pain relief! Most people are back to their normal activities within 1-2 weeks after surgery. About 20% of people may have diarrhea initially, but this usually goes away on it's own. Most importantly, those annoying attacks that motivated you to have the surgery will go away.