Ok so I have heavily overstocked my 25 gallon tank for the past 6 months knowing I was getting a bigger tank. Well the time is almost here. In less than 30 days I will have a 90 gallon.
Now getting this tank setup for them. I planned on removing all their water from the tank and placing it in the new tank but is this enough to not start a cycle again? Should I just fill half of the tank and run it like that and add new water each week like a reverse water change till I have a full tank?
I don't want to lose fish because I'm doing something good for them haha.

the water carries very little of the cycling bacteria found in a cycled tank so you can put all of your old water in the new tank and top it off with saltwater until the proper maximum water line(i marked mine with a marker) is reached. Your tank will cycle again no matter what you do because you will be stirring up alot of stuff but the more established rock you have, the faster it will cycle.

You should take pics of your setup as you go I like watching tanks get built from the ground up.

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36 Gallon Saltwater reef tank
Ocellaris Clown, Scooter Dragonet, sandsifter star, Decorator crab, emerald crab, coralline snails, blue leg hermit crab, and horseshoe crab.
Zooad's and shrooms
40 pounds of Live sand, 20 pounds of LR

when you change over use the same filter, alot of your good bacteria is in the filter media you need, just keep it wet when changing over it will help, if you have any decerations in the old tank, place them in the new tank as well that will help some as well

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What happens if you get scared half to death, twice?

Yeah, your filter shouldn't be cleaned when moving.