If I were you, I would find a Board Certified Orthodontist in your area and call to see if they offer a free consultation. These consultations are usually pretty quick and may involve some complimentary photos and x-rays as well as an office tour to let you get a feel for the competence and friendliness of the orthodontist and their staff.
This website will allow you to find a Board Certified Orthodontist.
A single displaced tooth is probably more a cosmetic concern. If you can keep everything clean you can likely avoid braces unless the misplaced tooth bothers you
There are many different choices available for crooked teeth, but depending on the severity of crowding, not all are good choices. For your case, sounds like Invisalign, braces, and possibly retainers could be choices. Do remember that even though you may feel it’s one tooth, dentists are cognizant of your bite. Do visit your dentist or orthodontist.
It’s very difficult to give a definitive answer to your question without seeing your actual case.
In reality, the implementation of the treatment depends on the extent of improper position of your tooth and amount of extra space, or lack of it, available for correction. Actually, this information is extremely important and can affect the decision you make. In case if you have enough extra space, which is pretty rare in these kinds of situations, then it’s very easy to correct.