Pruning a small garden conifer
First post. I'm not a natural gardener, but I'm helping an elderly friend with her neglected garden and this will be the first of many questions regarding pruning shrubs.
She has what I think is some kind of dwarf conifer (I don't think the pic uploader is working - it says 'no file chosen') which needs to be cut down in height by at least 30%. It's approx 2m high and blocking a window. It does have a nice spread though.
I know I have to do it in winter, but otherwise, how should i go about the task?