I think the biggest factor is being honest with yourself and knowing your own limitations before you pull the trigger. Waiting to get a big animal down is not the time to learn this. If you found it a bag drive getting into the area to hunt, consider carefully the thought of doing that in and out 4 more times with 100+ pounds. Do you have that in you? And will the weather accommodate taking this much time. Terrain is also huge.

My most brutal packout by myself was an elk that was only a km from the truck. Was a miserable slog down into a ravine to get into the area that the elk were using to get to water. For me , it was through peckerpole bush over/under deadfalls that nearly killed me getting that elk out. I can tell you I wasn't proud of myself or patting myself on the back when that chore was done.