Ernest Wong, DDS, MS

This would take 2-3 months and might involve lower teeth too.  A relatively easy case based on the photo.

If you do your homework and find the 'right' dentist, it can be done.  But there is an outside chance that if the result is less than perfect and needs to be re-done, you will need to go back again in a future date, that means you will have to make a special trip.  

I would recommend finding a dentist in the city where you are living now.

It is certainly doable, but keep in mind that this procedure is not reversible, even if the dentist is doing no-prep veneers.  I would look into traditional orthodontics to see if it is a viable option.

With a mouthful of crowns, it is even more important to schedule regular dental checkups so that small problem will not turn into bigger one which might require more extensive treatment. Good luck!

Very hard to say, without a photo to go by. Gaps are relatively easy to close, overbite is harder. The cost also depends on where you live in the country. Good luck.