A young chap I know is one of the nine members of 239 Course who graduated from 2FTS last week.
Twenty started together at BFTS.
It's been a lot of consistent, hard work for 18 months. However, his observation is that those who spent every waking minute poring over the books and worrying about every little thing are the ones who dropped out.
One of the graduates even managed to succeed while living off base and helping his partner raise their two children.
I'd say my friend would agree with JosephFW's advice.