Buying a car in another state in not a real problem. The main requirements is that you are able to qualify if getting a loan or have the equity or cash. You must have insurance and whatever taxes that have to be paid will be handled by the dealer
It is not difficult to purchase a car in another state. If you are buying from a dealer, they will complete the necessary paperwork (for a small fee) to get the car titled in your own state. This is easy to accomplish.
You would buy it like it was any other car in your own state. However local regulations will dictacte how it should be titled. Check your local regulations.