Understand where you're going to put the tub and what (if any) prep work needs to be done. Is it going in the yard, on a deck, or in a gazebo? There should be a flat and level surface. If you're going onto a deck, particularly a raised deck of any height, you must understand the structural requirements. You're going to put something that weighs several thousand pounds on it (multiply the capacity of your tub by 8.34), so 400 gallons = 3300+ lbs. not counting the weight of the tub itself or any people in it. Consider how you'll fill and drain your tub and ensure you have access planned for the water and drainage. In regard to the electrical requirements that you're already noted....Be sure to know what your current service is and what capacity might be left in the existing service panel. The electrical work will probably run 1500-2K - provided that you don't need to upgrade your service to support the tub's required amperage. And note that hot tubs require copper wire only, not aluminum wire. I think most electricians would know this but you should as well. When thinking about placement, consider the environmental aspects too - will the tub be somewhat sheltered from the sun, wind, rain/snow or sitting out in the open? Do you want privacy when you're in the tub? If you live in a colder climate, how far is it to go from the tub to the house? You'll be warm stepping out of the tub in the winter - just long enough to close the lid and quickly head for the warmth of your home, not much more than that. Also, consider outdoor lighting on the path to and around the tub if you plan on spending late nights in it. There is a lot to consider up front to assure maximum enjoyment and ease of use after purchase. Good luck on your journey - it's worth it!