pay attention to what I said. Land nav is easy, you'll learn the army way of doing it.
Like I said, Infantry OSUT is easy. Sure you'll get smoked and yelled at and all that noise, but that's the name of the game. Just STFU and do what the Drill Sergeant tells you.
Airborne - easy as ****, seriously. Just STFU and do what the Sergeant Airborne tells you.
That takes care of the first 17 weeks or so (Infantry OSUT 14 wks, Airborne 3 wks).
The rest, I've already said and given you links to get more info. Don't sweat it, just do it. Overanalyzing/Overthinking it has been the downfall of many men.
BTW, in one of the ft benning links I posted, there's a 30,60 & 90 day workout plan prepping you for Ranger School.
Also, once you get into Regt, they will do a lot of work & training with you before sending you to Ranger School.
Now do some pushups and go for a run.
Let's go wheelin'!!