I replaced one of my controller boards last winter. I didn't have to take the furnace out to get to it. I think it had the little plastic stand off mounts that you have to compress to unlatch. Don't remember it being too difficult. Couple of months ago, I had to replace the electric element in my hot water heater and it had to come out. A real PITA. Next time I'll remember to turn the hw heater off when I drain it. The thermal shut off, shuts off after the element burns up. I think the furnace mounts like the hw heater. Dozens of screws and a gas line to disconnect.
Good luck.
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