scoop him into the cup he came in (or a bag) with the old tank water in there. Then, in the new tank, put him in to "bob", making sure he wont sink. After 5 minutes of bobbing to get used to the new temp, put a bit of new tank water in every 5 or so minutes for at least 10minutes. This should take at least 10-15 minutes in total.
Im assuming youre going to empty the tank to move it, so you should do this.
Before you put him in, allow the heater to warm up a bit to at least 76'. Monitor it when he's in there, dont let the temperature climb from 76-80 in an hour, thats too fast! That* will shock him. Make sure its gradual, and if its going too fast, unplug it for a bit and repeat.
If youre moving the whole tank, water included, you dont need to acclimate him again. Just plug the heater back in and its fine.