Fairly frequently we get a call from someone whose friends didn't show up to help, or whose movers didn't (more rare) or who way underestimated how much work it would be, or who just didn't realize that movers might be booked up on the day they wanted.
Most of us don't move often enough to get practiced at it, so there will always be some things we don't know. One important thing to know is that you should schedule any move when you get your date to get in to the new place. It would be good to have gotten the estimates and chosen a mover; and if your are really, really thorough, a second choice -- in case the first one is booked on your day.
This will potentially save you a lot of grief. Moving is stressful enough without last minute worries about who is going to move you.