Kevin's comment reminds me of the Narnia books I read as a kid. The kids transported there got more grown up the longer they were in that place. AK does something similar, when it's just you and who/what you have in camp you become more self reliant.
We got ours packed out last year. Both were less than half mile pack-outs to where we could get the inflatable boat through very tough terrain. It was swampy swampy stuff. Lots of places it was just vegetation growing over water and nothing solid underfoot. We avoided that as much as possible. We still sunk to our knees many steps in mud. I felt like we prepared well and it was still tougher than I anticipated. The mud made it much harder for us. I have packed elk quarters on solid ground miles with less effort. It is not impossible though, you can do it. There was a huge difference in quarter size/weight between my bull and my buddies younger bull also.
A few pointers from a novice, take them for what they are worth. Lots are not my ideas but those others shared with me that I found helpful:
Before the trip:
-Work out your legs, core, and wind. Work other stuff too, you will use a lot of it, but those are key
-Spend 2-3 days per week working out with a loaded pack. I packed an 80lb bag of quickcrete a lot on my pack
-Train both with and without trekking poles with the weighted pack. Without helps with core and stabilizer muscles
-Train places that strengthen your ankles, and wear something on the hunt with ankle support. I used Simms G3 boots and waders. I would have struggled in hip boots without ankle support.
-I spent time walking "pond laps" too. I would go to a shallow muddy pond and walk in my waders, get my knees and ankles used to the sucking pressure of pulling my legs out of the muck.
-I ride a horse a lot at work. I find riding a horse working a cow keeps my core strong. Think of ways to strengthen your back and core.
-Don't overdo it and hurt yourself right before your hunt.
-Watch Larry Bartlett's project bloodtrail
After shooting your bull in a reasonable location:
-Eat and drink before you start butchering. It will take several hours (3.5hrs on the first bull with 2 of us) It is work and it's better to start out fueled and hydrated.
-Use a saw if needed to clear brush from where the moose fell, and make a path out. Don't leave sharp things to fall on with a heavy quarter on your back
-Leave the leg's on until last, they help roll moose over
-Be careful getting up with a quarter. Help each other if possible. Don't let the quarter on your buddies back shift and smack you in the head with a leg bone as you get up. It hurts! I almost blacked out when it smacked me.
-Use trekking poles
-Plan your route, maybe by taking a lighter load first
-Be careful in bad spots. We had one place we used our pack frames like a stretcher and each took an end. The bog was deep and bad enough we didn't want to have a pack strapped to us if we fell, this way we could turn it loose if needed. We shuttled the meat that way to a hump on the other side and then put our packs back on
Prepare as best you can and you will be glad you did. My buddy did a lot of the same prep I did, more in some ways, and still had a knee injury that hadn't bothered him in 15 years flare back up. He also had back trouble before it was all done. He toughed through it, never even said it hurt until we were out of the field. It was a rewarding experience, Type 2 fun!