Waking up to a full battery every morning is the real upgrade. Having a dedicated charger at home means you stop worrying about range and start treating your car like your phone, just plugging it in when you pull into the garage.
The installation usually takes one day, but the prep work takes longer. Aim to book an electrician in the spring or fall when they are less busy with heating and cooling emergencies. Always get at least three quotes to make sure the labor costs are fair for your area.
Remember that the 0% window is a deadline, not free money. If you have a balance left when the 18 months end, the card company will start charging you regular interest on what is left, which usually gets expensive fast.