Probably worth remembering that one of the first things that the ambulance crew will do is remove all the stuff that you've spent ages applying. Consequently, only apply the bare minimum needed to preserve life and prevent deterioration. Just because you have a well-stocked first aid kit, doesn't mean you have to use it.
Arterial bleed? Put the tourniquet away and apply pressure to a pressure point.
Cut? - leave the bandages alone and apply direct pressure.
Broken bones? - Forget the splint, hold the casualty still.
Obviously, there'll be occasions, such as if you're alone, when you need to put this stuff on to allow you to progress around multiple injuries but, by and large, there'll be people around to assist and a carefully-placed hand will promote reassurance more than swathes of bandages that may cause more discomfort.