If you haven't already purchased a Handy assembly service through Wayfair you can visit Wayfair directly to purchase Handy services by adding an item to your cart. Once the item is added to your Wayfair cart, you'll have the option to add a Handy assembly service to your order:
You'll pay a fixed price for your Handy assembly or installation service and schedule a service appointment that works best for your schedule in Checkout. You'll receive an email from Handy confirming the time.
Your fully-equipped, background-checked pro will arrive and complete your service to perfection.
There's more details available on Wayfair's website here.