That's fine, I do too. It's simply a case of starting off simply and as they get used to that and are happy, move on to more distraction. All training is repetition and gradually increasing difficulty without moving too fast.

With high value treats/chews/bones etc, I would initially start with exchanging the item I'm asking them to give up with another high value treat.

All this can be done without conflict and stress and is a much more positive experience for the dog. There is no doubt that dogs learn more quickly with positive experiences.