It is tiring, but the rush of adrenalin keeps the fatigue in place for a while. Remember, moving in doesn't have to be done quickly. Just make sure you have the essentials you need set in place....some clothes, your bed, TV, phone, coffee maker. I've been here 6 years and am still sorting some things....
There are people who can be hired to help unload things if you are moving things yourself. There is time to relax and recharge....and make sure you make this a priority. There's plenty of time to work on the house, there's plenty to do to relax.