It all depends how much of a sacrifice you and your family are willing to make. The theory is learning, learning, learning, with QBs, QBs, QBs. I would suggest that you sit down and make a timeplan when you want to finish, take into account how many hours the theory is (650?) and divide by the number of days you want to be fininshed. Can you study the needed amount per day after working all day, taking care of your family, and nevertheless, learn successfully? Your partner and children will be as much a part of your success as you are since they will sacrifice the same amount of time as you invest. Be prepared to give up most of your social life in this period, too. The theory is not that tough, just time consuming. I have a HBSc in Geology, and found the ATPL theory not that difficult, just hard work.