I agree those door hinge bolts,and brake booster ones suck a$$ to get at too..nothing worse that lying under the dash ..
Taking a square body truck's nose and cab off is fairly "easy" when your in good physical condition..especially if your just parting it out,and aren't really concerned about ever re-assembling it...
Thinking back,the ones I have done didn't require taking off the front bolts in the radiator support,the frame mounts rotted enough to allow the rubber cushions to be lifted right out with no resistance--that's why I dont recall how to get at those bolts--never HAD too!..
But if your "restoring" it,and want to save certain things,not just chop wires,etc,you'll soon be discouraged by the number of things that wont come off intact--like those bolts holding the inner fenders to the firewall (almost always bust off ,or rip the mount off--to my surprise I got the drivers side one to come out on my truck intact yesterday though),and wires that won't unplug without wrecking the connectors,etc..
I probably could take the nose & cab off my pickup in less than a day,most of the worst part of it would be taking everything off the inner fenders like the plow's control valve body & cables,the batteries,and all the wiring..but when it comes to hoisting the nose off alone,using a cherry picker,bucket loader,etc,its unlikely it'll come off undamaged..then I'd need a week or more flat on my back to recover,before any re-assembly could proceed...if I recover--lately I feel every time I attempt any projects I never fully recover..
I decided yesterday after seeing the frame bracket for the front drivers side "nose" mount bolt has rotted enough to just let the rubber cushions fall through it and not "hold" anything,that I was NOT going to waste my breath trying to fix it "right"..what I ended up doing kind of worked,but not as well as I had hoped it would..
I used one of those chrome "trim rings" you'd put around a bathroom pipe in a house,that snap open so you can get it around the pipe without having to take anything off the pipe--I was able to get it under the rubber cushion after jacking up on the nose,on the top side of the frame mount-that was large enough to prevent the rubber from just falling through the mount..
--then I cleaned up the extra threads on the bolt,got another nut to screw onto it--and put several large washers with a hole larger than the existing nut on the bolt over it,then a short pipe spacer,bigger inside than the nut's diameter--then the "new" nut was able to crush the big washers against the cushions enough to keep the nose from just "floating" like it was--but the bolt started spinning,and there's no way to get at the top side of it without a major undertaking--so I said

,and called it good enough..
Even if I take the upper plow lift frame off,there is two mounts that tension straps bolt to,sticking up in front of the grille,behind the bumper,and are welded right to the frame-(whoever made the push frame for the plow just boxed in the frame rails with 3/8" plate for about a foot,and welded those anchors for the straps on them too)-- -so I doubt I could get the grill out anyway--it needs to swing out from the bottom in order to be weaseled out of there...ain't happening,unless you hoisted the whole nose up....don't feel like trashing a good grille either...the whole nose could be lifted off intact still probably,but screw that...I'm not up to doing it alone..
I may be able to use a hole saw to cut a hole in front of the radiator so I could get a socket with a long extention on that bolt from above,and tighten it more--but I'm unsure it would work,and where exactly to cut it to gain access...
I noticed while under the truck the past week,that the frame has a good pile of rusted flakes about 1" thick all along its lower lip...hit it with a hammer and pounds of rust drop to the ground...I suppose I had better take it to a car wash and blast it all off before it encourages more rot...
I also noticed the 6.2 is leaking oil onto the drivers side exhaust manifold,and it appears to me its coming from between the head and block--this isn't new,its been oily there since I've owned it,and doesn't really leak enough to "drip",just covers the rear of the block and manifold,and gets on the oil filter--its not the oil sender or valve covers either,it is bone dry up there--this is another nail in its coffin far as I'm concerned...
The cab now has some rot in the rockers and that "brace" that runs between the front and rear mounts,and the roof is trashed,it has 1" of bondo and is rusted bad under it,the area over the windshield above the visor has rotted enough to need roof tape applied to prevent a shower every time it rains..
I'm thinking at this point I am probably better off looking for another truck of similar vintage with a better body,nose,and cab,and part this one out eventually..the truck is still "restorable",just not by ME ...I'm getting discouraged enough to give up on ever having a decent 4x4 again,of the vintage I would prefer to own..