I cut down the bunches of berries with scissors or secateurs and strip them off later at home. I've got a sort of dustpan with teeth that does the stripping and it collects the berries but I wouldn't do the stripping directly off the tree.
The dustpan gadget came from a local seed merchants and it works with blackcurrants and similar fruit.
Regarding the fruit, I put a cupfull in a bottle of vodka. After a week you have a cordial which is rather like port or a rich red wine. I drain off the cordial and rinse the berries with a little water to recover as much as possible. It still needs diluting but you have the choice of water or something like apple juice added just before drinking.