Hello, Aesthetic /cosmetic dentistry is a little expensive than other services however, since it's the front 4teeth I would advice you to get e max veneers as they are highly aesthetic . The procedure involved differs depending upon the reason for doing Veneers. If you have to take the teeth slightly in , the dentist has to check the amount of reduction required also they ll have to decide on if taking those teeth so much is possible or an additional procedure like intentional RCT is required or no . If the veneer are placed to closed the front gap then generally it's an easy procedure . A mock up is done before the final veneer cutting in order to check if u like the new positioning or the shape of teeth . Also first the dentist will reduce the teeth slightly followed by making impression to send it to the lab . Along the entire procedure you will have temporary veneers . A trial is done in order to check so that the colour matches well . Following this the final veneer is bonded . As you also suggested you need to change your metal cap you can get it replaced with an eMac or a zirconia crown (these are full ceramic crowns)

A procedure as intricate as a veneer cannot be "explained" in detail on this platform..... talk to your dentist who has suggested this treatment to you..... He will be able to explain the same thing to you better by the use of models or pictures. Alternatively you can also search for the videos on YouTube. The time taken also depends on the skill of the dentist and the condition of your dentition at present. The metal cap can also be removed and replaced by a new cap, whether it is metal ceramic or zirconia. This procedure should take approximately 2 sittings.