Is it still dormant? If yes prune away! When did you plant it?

You can prune rubbing, damaged, poorly spaced branches anytime. Go for it!

I planted it this past weekend. Yes, it is still dormant. I was concerned about adding to the stress of being planted by pruning.

Yes. If it's dead, damaged or badly placed, get it out of there.

I often prune trees and shrubs when I plant them to decrease the amount of foliage the roots have to support.

I like the lattice. That's new too isn't it? Don't recall it from your last photo.
Do you plan for clematis for the lattice area?
It will grow happily entwined up into the stair railings so if you think the railings will need painting/staining in the next few years, might want to do it in advance of planting. That way you don't have to chop back vines for several years.
The foliage will help keep the sun effects off the wood so the paint/stain lasts longer.
Clematis has a certain bloom time and span but you can put annual vines like cardinal climber to bring color to an
already bloomed perennial vine.

I would love to plant Clematis on the lattice but it needs to be "removable" as we use that space under the stairs for storage of the wheelbarrow, shovels, potting soil and such. It is actually just hanging on 2 hooks.
I pruned this weekend. I tried to remember everything I had learned and still be on the cautious side. I figure I can always prune more next year. Thanks everyone for "giving me permission" to do what I wanted to do!