This is super simple.... buy a generator, I got a 8000w constant (10500w surge up) used, with electric start (battery was dead) or pull start, for $450, included a 8' 4 wire 4/0 wire and 4 ends, 2 for 50 A and 2 for 30A service, starts on one pull every time....
You take a wire of sufficient size (4/0 IIRC is big enough) and put two male 50A male dryer plugs on it,,, one goes into your generator, one into the dryer plug... BUT when the power goes out, BEFORE you start the generator you HAVE to turn off the main house-grid breaker.... or else you are back feeding power into the grid.. your neighbors house and lineman...etc.... THEN you have to figure out what is important to run... and add up the watts or amps and do the math... TV and Satellite are great, you do not need heat, refrigerator... maybe, maybe only run it every so often... or put things in coolers on ice/snow.. you might have to disconnect the frig when you turn on the water heater.
OKAY so you have your MAIN house breakers OFF,,, and all the small breakers ( labeled ) and OFF,,, your generator connected to the house through the dryer plug... start the generator, and turn ON the small breakers to make the circuits hot you want to run items off of (assuming you have figured your load and lowered it by about 25-35%) : refrigerator, freezer, water heater etc.....
The hardest part about this is figuring out what breakers go to what circuits,,, but just about every house I have lived in did not have a properly labeled breaker box, and figuring this out alone sucks.
My generator has a briggs 20 hp v twin.. .the gas has lasted longer than 30 days. It would probably last longer if you used Stabil and bought non-ethanol gas. As far as gas vs propane etc, I am pretty sure you can find conversion kits for propane and maybe natural gas, and it cant be that hard, but I do not know if you have nat. gas out in the boonies....
You are smart enough to do this.
Two hots, one neutral and one ground... your dryer probably only has 3 wires, 2 hots and a ground...
hiring someone does not guarantee a good job will be done,, you will either have to do some of it manually IE disconnect the house from the grid or pay for an automatic switch which will be big bucks.. and you will STILL have to turn some small breakers off because the generator you are looking at will be underpowered... and you know y'all will accidentally turn the lights on in the kitchen while under gen. power.., because you forgot... etc..
Buying/connecting a small generator will still mean some human interaction to make it safe,, either by purchasing a costly auto disconnect switch (like ones used by chicken houses around here) or by manually disconnecting the house before the generator is started...