Two more things that aren't stressed enough:

Practice.

Don't practice with your "carry" tourniquet -- buy a trainer or "demote" an older TK to trainer status and never carry it for live use. Ditto for chest seals, compression bandages, wound-packing gauze, and so on. Obviously some of these things have very limited reusability even in training.

Re-train.

The knowledge and skills you gain from training are perishable. Also the training curriculum may change as CoTCCC (in particular) learns more about what does and does not work in the real world. I've taken a number of trauma classes from several instructors and learned something new at each one.