John
I assume you are pretty competent shooting your double. From there I would suggst get as fit as possible, you'll enjoy it more. Look at pics of elephant, trying to ID where to shoot it, starting now (you propably started this along time ago.) Discuss your shot options with your PH beforehand, preferably on dry stalks. IMO the best advice is still the old broomstick out of the earholes- break the middle rule. Also, connct the left eye with the right earhole and vice versa. The lines cross in the frontal lobe of the brain. Try and put your bullet just behind that.