If you have an excellent dentist who uses a top lab to produce your crowns, you should have very few problems. There will be little extra preparation done to your teeth other than removing the crowns which are already present. You may experience some slight sensitivity until your new crowns are bonded in place but after that it should disappear.
The longevity of veneers very much depends on the quality of the lab used and your dentists' understanding of veneers. If you go for cheap veneers you would be lucky to have them last 5 years. If they are placed by a dentist who uses sound principles and using a top lab they can last 15 years or more on average. It very much depends on the capability of the treating dentist and technician.
You should be able to have all the work done with very minimal discomfort
I hope this helps
Kindest regards
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