They should feel natural. Minor adjustments at the delivery visit fine-tune your bite so chewing is comfortable on day one.
Yes. Targeted veneers can blend with nearby teeth when shade and shape are matched carefully. Your dentist will advise how many teeth give the best symmetry.
Sensitivity usually fades within days to a few weeks. Using non-abrasive toothpaste and a nightguard, if you grind, supports comfort.
Usually right away, as comfort allows. Avoid clenching or contact that could chip veneer edges; a mouthguard is wise for sports.
Porcelain color does not change with whitening. If you want brighter, natural teeth, whiten before planning veneers so the ceramics can match your preferred shade.