There's no need to pray. Go on a moderate deficit (depends on the persons BMR and TDEE and overall metabolism, but 300-500 deficit is pretty slow to moderate), keep your workout intensity the same (although you will be able to do more stuff because you will weigh less), do some cardio if you want to, try to hit 1g of protein per lb of bodyweight (don't go for perfection because you will be fine with a range of 0.7-1g), and that's pretty much all you can do.
Few things about muscle loss:
Muscle loss happens if you have too big of a deficit and on top of that you do cardio (cardio will not burn muscle itself).
Muscle loss will happen if you don't eat enough protein to maintain it or even gain some muscle if you're a beginner-intermediate. The less time you've been training, the easier it will be to gain muscle on a cut.
Muscle loss will be negligible if you're going to go to 10-12%. It only happens seriously if you're trying to go to single digits.
There's a thing called muscle memory. You will regain your lost muscle a lot quicker than the first time you gained it. So if it took you 6 months to gain it, and you lost it all, it will take you 2 months to regain it or something like that. This works for people who are injured and take a break and lose some muscle.