1. Tinting in any form is illegal , but you can do with more transparent films (70% transparency ) .
2.No , it requires professional job , as calliper and alloys both are prone to high temperature , so if not painted properly , it will wear.
3.For proper job , it is better to remove tyres from rims , and also chrome parts maybe painted / wrapped .
4. For Indian conditions full black is my choice , to sync with interiors , black with a mix of biege would look great , or Full black with stitch , biege thread . Present style is innova crysta's seat cover colour.