I have a large sarcococca, about 7 foot high, 5 across. It is probably about 20 years old. It has been pruned in the past by a hedge trimmer but has rather lost its natural character. I'd like to reduce the size and let it grow back naturally. I'm thinking maybe take out some of the top branches altogether. Or should I reduce it all over ? Can I prune into bare wood ? And at what time of year ? If I do it now I will loose spring flower, but maybe winter is better to stop sap bleeding. Advice needed please.