Perfect time now ice. Prune feed and mulch they'll shoot away.
Any tips to how far down? They all have lovely red shoots and scared I'll hurt them.
Is the bit on the right (sticking strait up) dead? If it is, cut it right back to the base. Some of the other branches have dead bits at the ends. Cut these off back to healthy growth just above an outward facing bud.
There are some tips on pruning in this month's GW.
I'm talking about the first picture you posted!