Using this harness and lead set is a breeze. First, choose the right size based on your pet's neck and waist measurements. Slip the harness over your pet's head and adjust it around the neck, chest, and stomach so it fits snugly but not too tight. Use the velcro and snap - on clip to secure it. Then, attach the lead to the clip on the harness. When your pet is wearing the set, always keep an eye on them to make sure they're safe. As for maintenance, you can gently hand - wash the harness in cold water with mild detergent and let it air - dry. Remember, the colour you receive might vary depending on what's in stock, so just be prepared for that.