Moving process for overseas

Well, this is the first time I've had to deal with movers and packers.  The whole process is nice, but quite stressful.  We had either a mover or packer every day of the week.  First to move stuff we were putting in storage, next the packer for 2 days for the stuff going with our household goods, then they moved that stuff, then we had packing and moving of the stuff that will arrive a few days after we do(unaccompanied).  I recommend moving the unaccompanied stuff before household goods as to you are limited to 1000 lbs and it becomes a guessing game.  They did a great job and were very patient with my disorganization.  I was always wondering though whether or not I tip them.  I did not and may be the worst person ever.  I don't know.  Maybe also wait to have your new tenants move in so their stuff doesn't confuse the movers.