some kind of red leaf viburnum..

with shrubs.. its not really when you prune.. EXCEPT if they are flowering.. then we prune after flower ...

but more importantly.. HOW you prune ...

when you find out what they are.. visit the appropriate forum.. for tips on HOW TO PRUNE ...

ken

Need another picture further back. Could be a Cotoneaster sp.

I'm thinking a purple weigela like wine and roses or something.

Loropetalum?

Here is a link that might be useful: {{gwi:143072}}

Not sure where you're located, but is is not Loropetalum?

PS viburnums have opposite leaves