Be firm and consistent
Make sure they are confident and relaxed
Make sure your cat or dog is in top condition, this is a long term lifestyle not just the day before
Ensure they understand what they are taking on and the worst challenges they could have.
A paddling pool to play in and plenty of shade.
Change your routine, make sure to walk early in the mornings or early evenings when the sun is not at its hottest
Keep them with you and keep them occupied so that the noises are a pleasant experience.
Talk to your vet if your cat or dog has noise sensitivity