How difficult is it to convert a portable generator to nat gas?

Is it a propane generator? If so you will need to change orifices and regulators to ensure you get sufficient fuel to the generator.

If it’s a gasoline or diesel powered one, I have no idea but think it would be pretty damn hard

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Tip to the folks that have a hard time starting engines after being laid up. Feed propane continuously into throat of carb to start the motor first time. It’s better than using ether.

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Does it require a certain pressure?

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It's not so much about the pressure as it is volume. I looked into it once and based on the size of my generator (8000 watt) and the distance from the gas meter (approx. 70 ft) I was going to need a 1" supply line. The website I was using sold the conversion kit and also sold rated hoses that could be used to supply the gas from a connection at the meter. I did not check local codes to see if a hose would be legal, so?

Most of the conversion kit websites have a drop down list of compatible generators. But nowadays there's probably hundreds of brands of generators, so the list may not work. When in doubt just call the kit manufacturer and they should be able to match your generator if it isn't on the list.

Like someone said, you will lose some horsepower/wattage so you should probably start with more generator than you need. Good news is I don't know of any storm event on this part of the gulf coast where we lost NG. No gummy gas residue in the generator either.