Well, if you do fire it up, I suggest setting the difficulty to Normal (down from Classic). Even for experienced tactical heads, Classic can be extremely tricky if you aren't familiar with mechanics you can work in your favor.

Your squad really feels like YOUR SQUAD once you start levelling guys up and customizing them to your playstyle. Figuring out how certain classes and loadouts fit together is one of the most satisfying elements of the game and Normal means you can get to that stage without the odd RNG outlier screwing you over.

Then there comes that moment when you're like "oh shit, I got WAY too bold right there" and you get punished for it when one of YOUR GUYS gets smoked. You're shocked, but then you realize your mistake, you internalize it for the future then you start training that next recruit to take his place.

And on you go...