Learn not only the list but the distinct articulation of each throat letter. Hamzah and ha are linked with the deepest throat area, ayn and ha (ح) with the middle, and ghayn and kha with the upper throat. Any of these after still nun or tanwin calls for clarity.
ء: «مَنْ آمَنَ» — clear n.
ه: «مِنْ هَادٍ» — clear n.
ع: «أَنْعَمْتَ» — clear n.
ح: «مِنْ حَيْثُ» — clear n.
غ: «مِنْ غِلٍّ» — clear n.
خ: «مِنْ خَوْفٍ» — clear n.
The governing feature is the following letter's throat articulation. Other letters, especially mim and ba, require a different decision.