I would buy two smaller turkeys -- 24 lbs is too big for me.
Also, I would cook one a day or two ahead, slice, and reheat in a baking pan with pan juices and covered in foil.
I actually sit down with my recipes and a pad of paper and work out my timeline, then write down my schedule, working backwards from the dinner time, and leaving 30 minutes extra (because I'm always on time; alternatively you can use the method my aunt relied on and always eat 2 hours later than advertised

). 11 am: prep turkey/preheat oven. 11:30 - turkey in oven. 12:00 chop carrots, etc. I write out EVERYTHING on my schedule, including when I need to take things out of the fridge. Anal maybe, but it so helps me feel in control the day of.
Suggestions to cook stuffing day before is good, also any other side dish possible. Cranberry sauce can be done several days ahead. Pies evening before.
Buy the gravy. First time is no time for trying to perfect scratch turkey.
Good luck!