audi 80 coupe windscreen replacement

[BruceB14]

Have only been a coupe owner for a short time an have a crack developing in my windscreen,I have spoken to a few people that said the windscreen is difficult to change and can involve water leaking into the car if not fitted correctly,has anyone had this experiance and could pass on advise on the best people to speak to for a sucessful replacement (south coast area).thanks in advance.
Bruce