Think big while taking small steps. FIRE is a big life-goal and can be overwhelming. You're playing a long game, at least 10 years if not more. The key is to have a sustainable trajectory and to be moving in the right direction. Don't attempt to do all the things at once, and don't think that you're going to change your entire life on a dime, not gonna happen. Change itself is analogous to reaching FIRE: slow and steady wins the race.
So, pick one thing to focus on at a time. Start with low hanging fruit, things that are easy to change, and address these first. Once you've addressed an item and established a new norm, which could take a week or even months, then move on to the next. Make a habit of doing this and over a period of years you'll make substantial sustainable change.
And don't poo-poo the little things...lots of little things in aggregate add up to big things. Yes, that $5 daily coffee isn't going to break the bank, and I don't think it makes sense to pick on this as some kind of moral failing. BUT, $5 a day adds up over time. If a 20 year old invests instead of ingests $5/day, over 45 years (e.g. by traditional retirement age) this would grow to about $1M at 9% annual compounding growth.