Moving Company - Yes Or No?

I’m about to move, again, and want to know exactly what it costs to hire a moving company to help me out.  I’ve had bad experiences moving by myself in the past, and want to have the help this time of people that are experts at moving.  I would also like to know if a moving company can help to pack the boxes, supply the boxes, and such.  Ideally, I would like someone to help with the entire process because it is totally overwhelming for me, as it is for so many people.  So what are the costs, and capabilities of a moving company?  Preferably, it would be comparable to renting a moving trailer, or truck myself.