Any pruning now of the live wood will remove blossoms for next spring although if this doesn't matter to you, you could prune them anytime. You are in a pretty cold area so it might be best not to trim them too severely at this time of year. Ordinarily we prune immediately after blooming. This gives the plant time to grow and set flower buds for the next year. On the whole though one can prune most anytime without killing the plant.
Most people put plants too close together.
It is nice looking at the time, but can be a mess later on. Remove the trimmings and perhaps give them mulch of some kind, whatever people use in your area. This is different and I'm not sure what to tell you about these. The basics apply for both. I think I'd wait until next spring to see how to shape the plants after removing obvious dead or diseased wood now.