yeah if its a mk2 and you have a plastic battery bucket thing that the battery drops into make sure you check the physical size of the new battery before you leave shop as lot of the books they use to find a battery are wrong size to fit in that bucket.
One BIG tip, disconnect the negative terminal first, as the whole of the cars chassis/bodywork is connected to that negative terminal, if the positive terminal touches a piece of metal you will short circuit your battery! Upon reconnection, connect positive terminal, then negative terminal.