You're fine. Hell, yours looks TONS better than mine did when I smacked the back of an 18 wheeler
The steps below are alot out of order from how I did them, but that's partly to compensate for keeping it look decent int he street and protecting some components from the weather. I happened to be working for a dealership at the time, so i had time and space.
You're from up north so this will be harder than here in texas, but...
#1: Take a cardboard box, paper sack, plastic bag, or any combination of the 3, and cover up the PCM on the passenger side fender. We don't want that getting any kind of wet.
#2: Crawl under the truck, and see if the cab mounts got sheared off or mushed around. The cab definitely moved, but i don't think you hurt the frame. I think you just shoved the cab around on the bushings like I did.
#3: Unbolt the upper core support that has the hood latch. It's 4 or 5 bolts on each end on the front/back, the 2 radiator support bolts, and the hood latch. Remove it. It'll pop straight up. Yours looks more salvageable than mine was.
#4: Unbolt the fan shroud from the radiator. 10mm and there's 4 or 5 of them. You'll have to wrestle it off since it's against the pulleys, but don't worry. it's only plastic, you wont break it.
#5: with the upper core support and the upper fan shroud out of the way, you can remove the fluid bottles. 3 10mm screws on each side i believe. Leave the radiator overflow on the bottle, unhook it at the cap. This helps reduce spilling. Same with the washer fluid tank, leave the hose on it if you can, and plug it with a bolt or golf tee. Again, you may have to wrestle it off.
#6: OK, so you have the upper core support, fluid bottles, and upper shroud out of the way. Now you should be able to see most of the major damage on the engine side, if there is any. Did the radiator shove into the fan? If so, it may have knocked the water pump shaft back into the timing cover. I took my clutch fan off long ago, so I got lucky there (my radiator was about 3" from the front of the pulley).
#7: Remove the air box lid. If you can separate it from the hat, leave the hat on. If not, cover the throttle body with something to keep moisture out.
#8: remove the air filter and the air box. There's a 10mm nut up on the fender (and it probably broke off line mine did) and one somewhere else, i think inside?
#9: with the airbox out, you can now see if the A/C lines were damaged. Also, now you can get to the fender mounting system much easier.
#10: remove the plastic fender liner. They make a tool for the christmas tree fasteners, but you can do it however you like.
#11: remove the 13mm nuts behind the PCM that attach the fender to the hood hinge brackets on the cab
#12: Remove the ground strap behind the passenger side headlight
#13: Remove the 13mm bolts under the fender that attach it to the cab. Theres 3 I believe.
#14: Remove the three 13mm bolts mounting the fender to the lower core support (the 3 obvious ones on top)
#15: Remove the fender. I think there's a few minor things that mount it that I have forgotten. Check before pulling.
#16: Remove the front bumper. There are 4 17mm or 18mm bolts on the very front of the frame rails, and you WILL need the sawzall to get to them, just like I did. There may also be some bumper supports underneath. Some trucks had them, some didn't. The bumper should quite literally just fall off.
#17: Evaluate the lower core support. It looks like you got lucky and it may be intact like the top is.
#18: Reverse all that stuff with new parts