When you are moving an entire household's worth of belongings, it can be a rather daunting task which requires slightly different planning from moving the limited amount from an apartment. You now have to contend with furniture, as well as an increased number of belongings that have somehow managed to accumulate over the years. When moving this much, it is likely that you will have dozens of moving boxes, some of which you may not be able to move on your own once they are fully packed.
You will quickly find that moving an entire household into a new home can be rather difficult on your own. Everything will go better and be safer if you hire some local help. If you are doing this, there is no guarantee that a box of china won't be dropped or your plasma TV won't enter your new home with a few more scratches and dents than you previously remember, so you want movers with a solid reputation and an equally solid insurance policy.
The higher the value you place on your belongings, the more likely it is that you will want to hire professional movers for household moving. Not only will they have an easier time moving cumbersome furniture, but they will give you peace of mind (or, more likely, allow you to worry about other things like unpacking everything in your new home). You may have been able to move out of your last apartment with a rented truck, but the sheer quantity of boxes that need to be transported when moving into a new household is reason enough to hire professionals.