You may need bigger/ wider shoes than usual to accomodate your feet swelling over the length of time.
I did my training runs as a "compass". I parked the car at a central point and set my garmin to do a workout of 3 or 4 out and back legs. So a 10 mile run is broken down into 8 legs of 1.25mi, so each time I'm back at the car I've done a 2.5mi block. Even on my longest marathon runs, I was never more than 3mi from the car if there were any issues. It also allowed me to adjust winter layers on/ off when running in weather substantually colder than my April race. It was also more managable mentally that each stage of the run was a short distance.
The only run I struggled with was my 20mi for a few reasons. The biggest one was I brought it forwards due to snow being forecast, and I was not fully recovered from a HM race 5 days earlier. Every step ached from tired muscles. I genuinely didn't know at halfway whether I could complete it and ended up tweaking my route to make it more accessible if it all imploded. But I did it! The weather was also awful, 3-5⁰C dampish fog and that chill that gets in your bones. Everything was shades of black/grey/brown and all colour leached from the world. It was a long time to be aline with my brain despite listening to radio and podcasts along the way. I remember being in the late stages having to wait at a major road junction and dancing like a nutter waiting for the lights to change because I didn't dare stop my body from moving 😂
But I knew even while pushing and forcing myself through it, that this was the hardest moment of the whole process, because on race day I'd be fresh, there'd be an atmosphere, spring would have kicked in and all I'd need to do is follow/ pass the person in front.
I tend to view HMs as a 10mi run and a parkrun. I saw my marathon as a 20mi run (which I'd already done!) and a 10k race. And every step of that 10k race was a new pb for distance!
I jeffed. I'd been injured and deferred a year earlier so was cautious, but actually it's great zone 2 training and keeps fatigue down. I also did a plan where I did my long run every other week and a mid-length run between to allow for recovery. My other runs were short and I ran 3-4 times a week plus keeping up strength. I kept up with parkrun and that was my faster running. I also allowed some flex for life getting in the way- which it did with the snow, hotly followed by illness from DS.
Being used to HMs, it was only really mastering 14, 16, 18 and 20mi that was new. Just 4 long runs! Mentally that made the plan much easier. I'd actually gone from the start of C25k to 26.2 in a year and after each stage of training had a few weeks consolidating and recovering at each level. However that's easier for having retained experience even if the body is rebuilding.
Other than the 20mi, I genuinely enjoyed the training and race.