I've done a few tank transfers, either for myself or a friend. Trick is to keep everything warm. Since you are going straight from one tank to another, that's not a huge problem. But be cognizant of that as that's probably the number one cause for a lot of issues.
If you are not in a rush, set up the other tank with sand and the few new pieces of LR, along with a few scoops of sand from the existing system to help seed it, then add your livestock and rock a week or two later. I agree with transfering some oo all of the water as well. I find it makes a big difference. I've done full swaps in a single day and haven't list a thing. The only time I had was when the temperature dropped too much
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