Hi mate welcome to the club, If I where u before you buy it get the person to do a compression test on it first, could be very expensive car if you have to do alot of work to it
Na jus put a screwdriver in it, but just put a rag in there aswel it will stop it spraying all over the place. If your worried about getting caught just do it wen it's dark ;)
Take the refil cap off think it has a h on it? Put a rag over the hole, (it's like a tyre valve) Press it with a screw driver, Until pressure has gone, Mine was empty anyway lol